diff --git a/README-dev.md b/README-dev.md
index 48e6fefe3..3240f3015 100644
--- a/README-dev.md
+++ b/README-dev.md
@@ -57,7 +57,7 @@ During the coding of Miller, I've been guided by the following:
   * If you want to fix a bug, you should be able to quickly and confidently find out where and how.
   * If you want to learn something about Go channels, or lexing/parsing in Go -- especially if you don't already know much about them -- the comments should help you learn what you want to.
   * If you're the kind of person who reads other people's code for fun, well, the code should be fun, as well as readable.
-  * `README.md` files throughout the directory tree are intended to give you a sense of what is where, what to read first and and what doesn't need reading right away, and so on -- so you spend a minimum of time being confused or frustrated.
+  * `README.md` files throughout the directory tree are intended to give you a sense of what is where, what to read first and what doesn't need reading right away, and so on -- so you spend a minimum of time being confused or frustrated.
   * Names of files, variables, functions, etc. should be fully spelled out (e.g. `NewEvaluableLeafNode`), except for a small number of most-used names where a longer name would cause unnecessary line-wraps (e.g. `Mlrval` instead of `MillerValue` since this appears very very often).
   * Code should not be too clever. This includes some reasonable amounts of code duplication from time to time, to keep things inline, rather than lasagna code.
   * Things should be transparent.  For example, the `-v` in `mlr -n put -v '$y = 3 + 0.1 * $x'` shows you the abstract syntax tree derived from the DSL expression.
diff --git a/docs/src/manpage.md b/docs/src/manpage.md
index 1fc50504e..9b0cc8c49 100644
--- a/docs/src/manpage.md
+++ b/docs/src/manpage.md
@@ -1627,7 +1627,7 @@ MILLER(1)                                                            MILLER(1)
          -r {input field regex} -o {key-field name,value-field name}
          These pivot/reshape the input data such that the input fields are removed
          and separate records are emitted for each key/value pair.
-         Note: if you have multiplep regexes, please specify them using multiple -r,
+         Note: if you have multiple regexes, please specify them using multiple -r,
          since regexes can contain commas within them.
          Note: this works with tail -f and produces output records for each input
          record seen.
@@ -1927,7 +1927,7 @@ MILLER(1)                                                            MILLER(1)
                     As of Miller 6 this happens automatically, but the flag is accepted
                     as a no-op for backward compatibility with Miller 5 and below.
        -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-                    smoothing), near under under 1 is light smoothing, near over 0 is
+                    smoothing), near under 1 is light smoothing, near over 0 is
                     heavy smoothing. Multiple weights may be specified, e.g.
                     "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
                     is "-d 0.5".
@@ -3135,8 +3135,8 @@ MILLER(1)                                                            MILLER(1)
        int: declares an integer local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'int x = 0.0' is an error.
 
-   1mmap0m
-       map: declares an map-valued local variable in the current curly-braced scope.
+   map
+       map: declares a map-valued local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
        always OK. map b = a is OK or not depending on whether a is a map.
 
diff --git a/docs/src/manpage.txt b/docs/src/manpage.txt
index 7a55b3678..a823bd0d2 100644
--- a/docs/src/manpage.txt
+++ b/docs/src/manpage.txt
@@ -1606,7 +1606,7 @@ MILLER(1)                                                            MILLER(1)
          -r {input field regex} -o {key-field name,value-field name}
          These pivot/reshape the input data such that the input fields are removed
          and separate records are emitted for each key/value pair.
-         Note: if you have multiplep regexes, please specify them using multiple -r,
+         Note: if you have multiple regexes, please specify them using multiple -r,
          since regexes can contain commas within them.
          Note: this works with tail -f and produces output records for each input
          record seen.
@@ -1906,7 +1906,7 @@ MILLER(1)                                                            MILLER(1)
                     As of Miller 6 this happens automatically, but the flag is accepted
                     as a no-op for backward compatibility with Miller 5 and below.
        -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-                    smoothing), near under under 1 is light smoothing, near over 0 is
+                    smoothing), near under 1 is light smoothing, near over 0 is
                     heavy smoothing. Multiple weights may be specified, e.g.
                     "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
                     is "-d 0.5".
@@ -3114,8 +3114,8 @@ MILLER(1)                                                            MILLER(1)
        int: declares an integer local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'int x = 0.0' is an error.
 
-   1mmap0m
-       map: declares an map-valued local variable in the current curly-braced scope.
+   map
+       map: declares a map-valued local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
        always OK. map b = a is OK or not depending on whether a is a map.
 
diff --git a/docs/src/mlr.1 b/docs/src/mlr.1
index 846c12fa1..0a026dd4f 100644
--- a/docs/src/mlr.1
+++ b/docs/src/mlr.1
@@ -1729,7 +1729,7 @@ Options:
 -g {d,e,f} Optional group-by-field names
 -F         Computes integerable things (e.g. counter) in floating point.
 -d {x,y,z} Weights for ewma. 1 means current sample gets all weight (no
-           smoothing), near under under 1 is light smoothing, near over 0 is
+           smoothing), near under 1 is light smoothing, near over 0 is
            heavy smoothing. Multiple weights may be specified, e.g.
            "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
            is "-d 0.5".
@@ -3805,7 +3805,7 @@ Type-checking happens at assignment: 'int x = 0.0' is an error.
 .RS 0
 .\}
 .nf
-map: declares an map-valued local variable in the current curly-braced scope.
+map: declares a map-valued local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
 always OK. map b = a is OK or not depending on whether a is a map.
 .fi
diff --git a/docs/src/online-help.md b/docs/src/online-help.md
index cb40e17df..bdf05fb66 100644
--- a/docs/src/online-help.md
+++ b/docs/src/online-help.md
@@ -104,7 +104,7 @@ If you know the name of the thing you're looking for, use `mlr help`:
 <b>mlr help map</b>
 </pre>
 <pre class="pre-non-highlight-in-pair">
-map: declares an map-valued local variable in the current curly-braced scope.
+map: declares a map-valued local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
 always OK. map b = a is OK or not depending on whether a is a map.
 </pre>
diff --git a/docs/src/reference-dsl-variables.md b/docs/src/reference-dsl-variables.md
index 40c63d8a2..85ad66051 100644
--- a/docs/src/reference-dsl-variables.md
+++ b/docs/src/reference-dsl-variables.md
@@ -1155,7 +1155,7 @@ in: used in for-loops over stream records or out-of-stream variables.
 int: declares an integer local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'int x = 0.0' is an error.
 
-map: declares an map-valued local variable in the current curly-braced scope.
+map: declares a map-valued local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
 always OK. map b = a is OK or not depending on whether a is a map.
 
diff --git a/docs/src/reference-verbs.md b/docs/src/reference-verbs.md
index 92e694d3d..93bb0a60f 100644
--- a/docs/src/reference-verbs.md
+++ b/docs/src/reference-verbs.md
@@ -2558,7 +2558,7 @@ Wide-to-long options:
   -r {input field regex} -o {key-field name,value-field name}
   These pivot/reshape the input data such that the input fields are removed
   and separate records are emitted for each key/value pair.
-  Note: if you have multiplep regexes, please specify them using multiple -r,
+  Note: if you have multiple regexes, please specify them using multiple -r,
   since regexes can contain commas within them.
   Note: this works with tail -f and produces output records for each input
   record seen.
@@ -3398,7 +3398,7 @@ Options:
              As of Miller 6 this happens automatically, but the flag is accepted
              as a no-op for backward compatibility with Miller 5 and below.
 -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-             smoothing), near under under 1 is light smoothing, near over 0 is
+             smoothing), near under 1 is light smoothing, near over 0 is
              heavy smoothing. Multiple weights may be specified, e.g.
              "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
              is "-d 0.5".
diff --git a/internal/pkg/dsl/cst/keyword_usage.go b/internal/pkg/dsl/cst/keyword_usage.go
index 48693f26f..23340ccf8 100644
--- a/internal/pkg/dsl/cst/keyword_usage.go
+++ b/internal/pkg/dsl/cst/keyword_usage.go
@@ -428,7 +428,7 @@ Type-checking happens at assignment: 'int x = 0.0' is an error.`)
 
 func mapKeywordUsage() {
 	fmt.Println(
-		`declares an map-valued local variable in the current curly-braced scope.
+		`declares a map-valued local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
 always OK. map b = a is OK or not depending on whether a is a map.`)
 }
diff --git a/internal/pkg/mlrval/mlrmap_accessors.go b/internal/pkg/mlrval/mlrmap_accessors.go
index e0553f99a..9ad8e5999 100644
--- a/internal/pkg/mlrval/mlrmap_accessors.go
+++ b/internal/pkg/mlrval/mlrmap_accessors.go
@@ -8,7 +8,7 @@ import (
 	"github.com/johnkerl/miller/internal/pkg/lib"
 )
 
-// IsEmpty determines if an map is empty.
+// IsEmpty determines if a map is empty.
 func (mlrmap *Mlrmap) IsEmpty() bool {
 	return mlrmap.Head == nil
 }
diff --git a/internal/pkg/transformers/reshape.go b/internal/pkg/transformers/reshape.go
index 29872e17c..49f7048ff 100644
--- a/internal/pkg/transformers/reshape.go
+++ b/internal/pkg/transformers/reshape.go
@@ -63,7 +63,7 @@ func transformerReshapeUsage(
 	fmt.Fprintf(o, "  -r {input field regex} -o {key-field name,value-field name}\n")
 	fmt.Fprintf(o, "  These pivot/reshape the input data such that the input fields are removed\n")
 	fmt.Fprintf(o, "  and separate records are emitted for each key/value pair.\n")
-	fmt.Fprintf(o, "  Note: if you have multiplep regexes, please specify them using multiple -r,\n")
+	fmt.Fprintf(o, "  Note: if you have multiple regexes, please specify them using multiple -r,\n")
 	fmt.Fprintf(o, "  since regexes can contain commas within them.\n")
 	fmt.Fprintf(o, "  Note: this works with tail -f and produces output records for each input\n")
 	fmt.Fprintf(o, "  record seen.\n")
diff --git a/internal/pkg/transformers/step.go b/internal/pkg/transformers/step.go
index 8e13deb8f..c52129fc2 100644
--- a/internal/pkg/transformers/step.go
+++ b/internal/pkg/transformers/step.go
@@ -116,7 +116,7 @@ func transformerStepUsage(
 	fmt.Fprintf(o, "             as a no-op for backward compatibility with Miller 5 and below.\n")
 
 	fmt.Fprintf(o, "-d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no\n")
-	fmt.Fprintf(o, "             smoothing), near under under 1 is light smoothing, near over 0 is\n")
+	fmt.Fprintf(o, "             smoothing), near under 1 is light smoothing, near over 0 is\n")
 	fmt.Fprintf(o, "             heavy smoothing. Multiple weights may be specified, e.g.\n")
 	fmt.Fprintf(o, "             \"mlr %s -a ewma -f sys_load -d 0.01,0.1,0.9\". Default if omitted\n", verbNameStep)
 	fmt.Fprintf(o, "             is \"-d %s\".\n", DEFAULT_STRING_ALPHA)
diff --git a/man/manpage.txt b/man/manpage.txt
index 7a55b3678..a823bd0d2 100644
--- a/man/manpage.txt
+++ b/man/manpage.txt
@@ -1606,7 +1606,7 @@ MILLER(1)                                                            MILLER(1)
          -r {input field regex} -o {key-field name,value-field name}
          These pivot/reshape the input data such that the input fields are removed
          and separate records are emitted for each key/value pair.
-         Note: if you have multiplep regexes, please specify them using multiple -r,
+         Note: if you have multiple regexes, please specify them using multiple -r,
          since regexes can contain commas within them.
          Note: this works with tail -f and produces output records for each input
          record seen.
@@ -1906,7 +1906,7 @@ MILLER(1)                                                            MILLER(1)
                     As of Miller 6 this happens automatically, but the flag is accepted
                     as a no-op for backward compatibility with Miller 5 and below.
        -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-                    smoothing), near under under 1 is light smoothing, near over 0 is
+                    smoothing), near under 1 is light smoothing, near over 0 is
                     heavy smoothing. Multiple weights may be specified, e.g.
                     "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
                     is "-d 0.5".
@@ -3114,8 +3114,8 @@ MILLER(1)                                                            MILLER(1)
        int: declares an integer local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'int x = 0.0' is an error.
 
-   1mmap0m
-       map: declares an map-valued local variable in the current curly-braced scope.
+   map
+       map: declares a map-valued local variable in the current curly-braced scope.
        Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
        always OK. map b = a is OK or not depending on whether a is a map.
 
diff --git a/man/mlr.1 b/man/mlr.1
index 35b7da45b..40f9d51c0 100644
--- a/man/mlr.1
+++ b/man/mlr.1
@@ -2023,7 +2023,7 @@ Wide-to-long options:
   -r {input field regex} -o {key-field name,value-field name}
   These pivot/reshape the input data such that the input fields are removed
   and separate records are emitted for each key/value pair.
-  Note: if you have multiplep regexes, please specify them using multiple -r,
+  Note: if you have multiple regexes, please specify them using multiple -r,
   since regexes can contain commas within them.
   Note: this works with tail -f and produces output records for each input
   record seen.
@@ -2395,7 +2395,7 @@ Options:
              As of Miller 6 this happens automatically, but the flag is accepted
              as a no-op for backward compatibility with Miller 5 and below.
 -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-             smoothing), near under under 1 is light smoothing, near over 0 is
+             smoothing), near under 1 is light smoothing, near over 0 is
              heavy smoothing. Multiple weights may be specified, e.g.
              "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
              is "-d 0.5".
@@ -5126,7 +5126,7 @@ Type-checking happens at assignment: 'int x = 0.0' is an error.
 .RS 0
 .\}
 .nf
-map: declares an map-valued local variable in the current curly-braced scope.
+map: declares a map-valued local variable in the current curly-braced scope.
 Type-checking happens at assignment: 'map b = 0' is an error. map b = {} is
 always OK. map b = a is OK or not depending on whether a is a map.
 .fi
diff --git a/test/cases/cli-help/0001/expout b/test/cases/cli-help/0001/expout
index e96af8c8c..3605257ff 100644
--- a/test/cases/cli-help/0001/expout
+++ b/test/cases/cli-help/0001/expout
@@ -797,7 +797,7 @@ Wide-to-long options:
   -r {input field regex} -o {key-field name,value-field name}
   These pivot/reshape the input data such that the input fields are removed
   and separate records are emitted for each key/value pair.
-  Note: if you have multiplep regexes, please specify them using multiple -r,
+  Note: if you have multiple regexes, please specify them using multiple -r,
   since regexes can contain commas within them.
   Note: this works with tail -f and produces output records for each input
   record seen.
@@ -1109,7 +1109,7 @@ Options:
              As of Miller 6 this happens automatically, but the flag is accepted
              as a no-op for backward compatibility with Miller 5 and below.
 -d {x,y,z}   Weights for EWMA. 1 means current sample gets all weight (no
-             smoothing), near under under 1 is light smoothing, near over 0 is
+             smoothing), near under 1 is light smoothing, near over 0 is
              heavy smoothing. Multiple weights may be specified, e.g.
              "mlr step -a ewma -f sys_load -d 0.01,0.1,0.9". Default if omitted
              is "-d 0.5".