open (one's) big mouth

(redirected from opened their big mouths)
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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 ?
Whenever someone came close, they opened their big mouths and splashed the water violently," said Regis.
I used to quite like Jonathan Ross, but any respect I had for him vanished the moment he and Russell Brand opened their big mouths and ruined their careers.