keep your mouth shut
成語所屬單字shut
keep your mouth shut — 慣用語
1. To not say anything about a secret or something that might cause trouble.
1.慣用語
釋義
閉嘴；守口如瓶
To not say anything about a secret or something that might cause trouble.
例句
Mia kept her mouth shut about the surprise party.
Why can't you keep your mouth shut when it matters?