loose lip(s)

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loose lip(s)

The practice, habit, or manner of speaking too frequently and/or without discretion, especially as might unintentionally lead to revealing private or sensitive information to others. You've got a very loose lip, son. You'd do well to learn to keep it shut! The details of this project are extremely confidential, so make sure you don't have loose lips about it.
See also: loose
References in classic literature ?
The filed and blackened teeth behind the loose lips added the last touch of hideousness to this terrible countenance.
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The incident was a prank, and while serious, it was made more serious by the mayor's loose lip.
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seminar uses DVD scenarios, group discussions and workbook to help sensitize employees to the dangers of loose lips by:
EastEnders BBC One Wales Loose lips are yet again sinking ships as one of Ian's lies finds him out.
STANLEY MCCHRYSTAL'S LOOSE LIPS (The Los Angeles Times, Los Angeles)
She has also appeared on Celebrity Big Brother, released a workout video, and hosted Loose Lips for LivingTV and various other shows for ITV.
In this novel, the author uses her own name for the protagonist and the fact that she wrote a spy novel, Loose Lips, as an important plot device.
Thus in the movie depiction, loose lips resulted in the KGB being able to tip off Castro, who then took preemptive military action, resulting in the failure of the Bay of Pigs invasion.
The Defense Department: Catchphrases can't win a war unless they're loose lips sinking ships.
The CEO has asked Weller to re-orient Moncrief to the board's confidentiality policies, especially reminding him that loose lips sink ships.
Based on the play by John Jeter, Tricks looks at the loose lips that fueled the Watergate scandal.