Idiom number 128 which is a little bit impolite and informal, is zip, your lip. Zip your lip. And the meaning of this idiom is clear and everybody knows. So, zip your lip, which means Be quiet, close your mouth and be quiet. Or we can say keep your mouth shots. Don't say anything, usually because it's a secret.
Yes. So when you want to tell a person not to reveal, uncover the secret we can tell him or her to zip your mouth or limp. Let me give you some examples. I want to to zip your mouth. Don't speak about this subject. I don't want anyone to know it.
Other examples? Why don't choose zip your lip. I am tired of being nagged all morning. She's zipped her lip at the meeting yesterday, as it was pointless saying anything. She just stayed. Quiet sound she didn't see anything.