KEEP YOUR MOUTH SHUT


Meaning of KEEP YOUR MOUTH SHUT in English

( informal ) to not talk about sth to sb because it is a secret or because it will upset or annoy them :

I've warned them to keep their mouths shut about this.

Now she's upset—why couldn't you keep your mouth shut?

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.