mouth off

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.
See also: mouth, off
Farlex Dictionary of Idioms.

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!
See also: mouth, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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]
See also: mouth, off
The American Heritage® Dictionary of Idioms by Christine Ammer.

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!
See also: mouth, off
The American Heritage® Dictionary of Phrasal Verbs.

mouth off

in. to give (someone) back talk. If you mouth off, I will ground you for three weeks.
See also: mouth, off
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • lip off
  • run off at the mouth
  • run off at the mouth, to
  • shoot (one's) mouth off
  • shoot mouth off
  • shoot off (one's) mouth
  • shoot off at the mouth
  • shoot off mouth
  • shoot off one's mouth
  • shoot one’s mouth off
References in periodicals archive
"We're pleased to work with Shoot Your Mouth Off, its production crew and cast and hope the film does well when it goes on release."
Hospital welcome for Killer Cure!
Mick McCormick, Viewpark, said: "Kayal looks ridiculous after shouting his mouth off and Lennon should be pulling him aside to sort him out."
IN ASSOCIATION WITH H CHRIS ROBERTS TAKES YOUR CALLS R
You mouth off, why don't you back it up with substance."
GOING INTO SCRAP TRADE? Apprentice bust-up
I ACCEPT that Villa had to win some time, but how predictable that Mr Mellberg should waste no time in shooting his mouth off again.
Your Shout: Readers Letter
Obviously Dave is bitter about how their relationship ended, but why does he have to mouth off like this.
Maura Derrane: Telltales leave a bad taste
'Green shot his mouth off. He stuck out like a sore thumb and that has resulted in this prosecution,' John Bucher said.
Man with 5 wives guilty of bigamy
But Doddsy, whose two injury-time goals helped dump Zalgiris 4-1 in midweek, said: "It's been a nice week but it's pointless shouting my mouth off.
Football: Hero Billy ain't a cert for game
EVERY club has a player who likes to mouth off. Quite often he's wrong, and quite often he leaves his fans either cringing or bemused.
Stop talking rubbish Evra and get on with the game
WE'RE only four games into the new SPL season but it's interesting to note that Dundee Utd, St Mirren and Falkirk (the teams whose managers mouth off most about refs) are the three clubs propping up the table.
WE'RE only four games
Ms Aherne might find her life would be more private if she stopped giving interviews, shouting her mouth off and getting hammered in public.
Carole Malone Column: Hello! Earth calling daft Ms Aherne
After all, the BBC let him mouth off his own brand of politically correct humour for the best part of two decades.
ELTON CAN'T BEAR IT
We didn't want to mouth off and for there to be a circus around it.
the Razz: A happy reunion
Something Jowell might have remembered before she started shouting her mouth off.
The problem is Miss Piggy's fat sister.. not thin models
But we can expect the gobby gourmet to mouth off about his recent claim that women can't cook any more and how all the great chefs - in restaurants and at home - are men.
We Love Telly!: FOOD - THE 'F' WORD C4, 8pm
Yes, after spouting his mouth off for months about the Pars board, the Pars pitch and basically anything Pars related, Mr Sunbed finally got what was coming to him in the shape of a right royal horsing from Fife's Finest.
FOOTBALL: FANZINE: DUNFERMLINE