open (one's) big mouth

(redirected from open their 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 ?
The rank and file of the party is sick and tired of working our guts out only to see some clown of an MP open their big mouth and put us right back, " she says.
It would be a good idea if these people would come and visit the area before they open their big mouths.