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to mouth off
[phrase form: mouth]
01
to complain or speak loudly in an immoderate way
Slang
Examples
He mouthed off about the bad food the entire night.
They kept mouthing off about the price increases.
02
to speak rudely or disrespectfully, especially to someone in authority
SlangExamples
She mouthed off to the teacher and got detention.
Do n't mouth off to your boss; you'll regret it.
