a punctuation mark (,) used to indicate the separation of elements within the grammatical structure of a sentence
"The comma separates the items in the list."
anglewing butterfly with a comma-shaped mark on the underside of each hind wing
"The Anglewing butterfly displays a distinctive comma-shaped mark on the underside of each hind wing when it rests."
Wikipedia
"The comma is a punctuation mark used to separate items in a list or clauses within a sentence."
To place a comma or commas within text; to follow, precede, or surround a portion of text with commas.
"The editor decided to comma the phrase after every clause to improve readability."
In plain English: To comma is to pause briefly while speaking, usually by taking a breath before continuing your thought.
"Don't comma that name unless there is already an introduction before it."
Usage: This verb is primarily used in technical editing contexts rather than casual conversation. When discussing punctuation rules generally, the noun form "comma" is preferred over using it as an action word.
The word comes from the Latin comma, which was borrowed from the Ancient Greek kómma. This Greek term originally meant "a cut," derived from the verb meaning "to cut."