mouth off

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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. © 2015 Farlex, Inc, all rights reserved.

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. © 2002 by The McGraw-Hill Companies, Inc.

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. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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 Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
Mr McCullough, 30, from Glasgow, mouthed off at Chubby, 58, as he walked on the North Pier.
He played that way and mouthed off but he was once of the rare players who could back it up.
TV and radio star Chris mouthed off over the airwaves yesterday morning and told listeners to his breakfast show that the Scots boss will regret not including Super Ally.