mums the word
保密；守口如瓶
口語·要求保密或保持安靜
英文釋義
to keep quiet or to not reveal a secret or confidential information
例句
Don't tell anyone about the surprise party—mums the word until Saturday.
典故來源
源自莎士比亞戲劇，原指啞劇演員在表演中保持沉默，后引申為要求保密或保持安靜。