mouth off
1. To speak without discretion; to speak too loudly or freely, especially about sensitive topics or information. We would have gotten away with our plan if your dumb cousin hadn't started mouthing off all over town.
2. To make disrespectful comments; to sass someone. You're going to get detention again if you keep mouthing off to your teacher.
mouth off
to speak out of turn; to backtalk. If you mouth off, I will ground you for three weeks. Don't mouth off at me, buster!
mouth off
1. Complain or express one's opinions loudly and indiscreetly, as in She was always mouthing off about the other members. [Slang; 1960s]
2. Speak impudently, talk back, as in He got in trouble by mouthing off to his teacher. [Slang; 1960s]
mouth off
v. Slang To express one's opinions or complaints in a loud, indiscreet manner: Quit mouthing off about what you think is wrong, and go do something about it! Don't mouth off to your parents like that!
mouth off
in. to give (someone) back talk. If you mouth off, I will ground you for three weeks.