mouth off - definition and synonyms

phrasal verb [intransitive] informal
present tense
I/you/we/theymouth off
he/she/itmouths off
present participlemouthing off
past tensemouthed off
past participlemouthed off
  1. to give your opinions about something in a very annoying way, especially when you are complaining or criticizing something

    He’s always mouthing off about the state of the roads.

See also main entry: mouth