open (one's) big mouth

(redirected from opened your 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 ?
No one would ever have known about them if you hadn't opened your big mouth.
And Frank Bruno was last night warned: "You will be victim No 10 - you shouldn't have opened your big mouth.