Definition of mouth off in English:

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.
Synonyms
rant, spout, declaim, sound off
1.1 (mouth off at) Loudly criticize or abuse.
More 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.
Synonyms
talk insolently, be disrespectful
See parent entry: mouth

Definition of mouth off in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty