grammar police

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grammar police

Someone or a group of people who insist on correcting or criticizing others for errors in spelling, grammar, and syntax, especially to a pedantic or self-righteous degree. A: "What are you, the grammar police?" B: "Hardly. Everyone knows you shouldn't use 'ain't' in a formal paper." I don't mean to be the grammar police, but you shouldn't use a semicolon to introduce a list—that's the job of a colon.
See also: grammar, police
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.