open (one's) big mouth

(redirected from open her big mouth)
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open (one's) big mouth

To say something that is meant to be a secret; to say something in an indiscreet, noisy, or boorish manner. Why did you have to open your big mouth about my crush on Tommy? Why couldn't you just keep it between us? We would have gotten away with the plan if she hadn't opened her big mouth!
See also: big, mouth, open
References in periodicals archive ?
Janice finds even more to open her big mouth about this week, when her fleeting flame Roger returns, determined to decide whether the pair are going to be more than just good friends.
She could have just gone to an estate agent but, no, the PM's wife had to open her big mouth to a con man.
If she had to open her big mouth, the least she could have done was to give you all the information you wanted.
She surfaced, only to open her big mouth again and bitch about evicted Adele.