zip one's lip{v. phr.}, {slang} To stop talking; keep a secret; shut your mouth; be quiet.
The man was getting loud and insulting and the cop told him to button his lip. John wanted to talk, but Dan told him to keep his lip buttoned. Syn.: KEEP ONE'S MOUTH SHUT, SHUT UP.
See: BUTTON ONE'S LIP.
[TahlilGaran] English Idioms Dictionary ▲