open (one's) big mouth

(redirected from open 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 ?
Kicking off the new series with a look at youth, the foppish funnyman is raring to open his big mouth once more, he tells us: "I'mnot looking back at school through rose-tinted glasses - I hated it
Maybe he'll learn not to open his big mouth next time.
Leaving aside the fact that gobby David only has to open his big mouth to drain it in one, Roy jumping in to rescue him also has its problems.