Definition of mouth off in English:

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mouth off

1 informal Talk in an unpleasantly loud and boastful or opinionated way: he was mouthing off about society in general
More example sentences
  • When he mouths off to a pretty young teacher, he apologizes: ‘I'm sorry I sounded off on you.’
  • Nobody shows off or mouths off quite as good as a Leo.
  • If a kid mouths off, maybe he doesn't like you or maybe he's seen his mother beaten up by her boyfriend.
1.1 (mouth off at) Loudly criticize or abuse.
Example sentences
  • She had had to endure being mouthed off at all her childhood.
  • And so when someone blows up and mouths off at a guard or goes after somebody else about their kids, I totally understand where that emotion and that lightning-fast trigger comes from.
  • Some guy mouths off at him and they begin brawling.
talk insolently, be disrespectful
See parent entry: mouth
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