Question 1

What does "mouth off" mean?

Accepted Answer

To speak rudely or disrespectfully to someone, especially a person in authority.

Question 2

How do you use "mouth off" in a sentence?

Accepted Answer

He got sent out of class for mouthing off at the teacher in front of everyone.

Question 3

Is "mouth off" formal or informal?

Accepted Answer

"mouth off" is informal — used mainly in casual conversation. Used in both British and American English. Usually critical — the speaker disapproves of the behaviour. Can mean talking rudely to an authority figure, boasting, or expressing opinions loudly and inappropriately. Often followed by 'at' or 'about'.

mouth off

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