button one's lip

button one's lip также zip one's lip  {v. phr.},  {slang}
Прекращать разговаривать; сохранять в секрете; замолкать (заткнуться, закрывать рот); молчать.
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.
Категории: {slang} {v. phr.}