keep one's mouth shut
成語所屬單字mouth
keep one's mouth shut — 慣用語
1. to not say anything about a secret or a sensitive topic; to stay quiet when spea
1.慣用語
釋義
閉嘴；守口如瓶
to not say anything about a secret or a sensitive topic; to stay quiet when speaking could cause trouble
例句
Anya knew the surprise party plan and kept her mouth shut all week.
If Tyler had kept his mouth shut during the meeting, no one would have known about the error.