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to mouth off
[phrase form: mouth]
01
to speak loudly or complain, often in a bold or confrontational manner
Example
The employee was mouthing off at the manager during the heated argument.
During the game, the coach was mouthing off at the referee for making a questionable call.
She often mouths off when she disagrees with a decision.
He tends to mouth off about politics, expressing his views passionately.
While waiting in line, they are mouthing off about the service quality.
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