(one's) lips are sealed

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(one's) lips are sealed

One will not tell anyone; one will keep this a secret. Most often used in the expression "my lips are sealed." A: "Please don't tell anyone about this, I'm so embarrassed." B: "My lips are sealed." I told him not to say anything, and he said his lips are sealed, so hopefully he'll be able to keep a secret this time.
See also: lip, seal

lips are sealed, one's

One will reveal nothing, especially about a secret. For example, You can trust me with the details of the lawsuit-my lips are sealed. [Early 1900s]
See also: lip

your lips are sealed

If you say that your lips are sealed, you mean you will keep a secret that someone has told you. As for anything told to me in confidence, well, my lips are sealed. `The Player' is worth seeing for its deeply funny ending alone but my lips are firmly sealed on that. Note: You can also say that someone has sealed lips. Most people refused to talk to him about the murder. Everywhere he went he met sealed lips and a wall of silence.
See also: lip, seal

(one's) lips are sealed

Used to indicate that one will not disclose a piece of information.
See also: lip, seal