Cách sử dụng
The expression "keep your mouth shut" means to remain quiet and not speak, especially when it is not necessary or appropriate to do so. It is often used as a warning or advice to someone who may be about to reveal something they shouldn't, or who may be in danger of saying something that could cause trouble or offense. For example, if a friend tells you a secret, you might say "I promise to keep my mouth shut." Another example might be if someone is about to say something disrespectful or insulting, you might say "hey, keep your mouth shut, that's not cool."