open (one's) big mouth

(redirected from opens his 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 ?
Alan is an idiot and should think very carefully before he opens his big mouth.
It's a pity he doesn't stop and think before he opens his big mouth.
Why is it that every January Tom Brown opens his big mouth, and puts his foot in it by slagging Robert Burns' memory?