| Idiom | Mum's the Word |
|---|---|
| Example | Don't tell anyone about the surprise for Mr. Glick. Remember, mum's the word. |
| Meaning | you must keep silent; don't tell anyone the secret |
| Origin | Since at least 1350 "mum" has meant silent. The word itself sounds like a person trying to talk with her lips shut tight. "Mum's the word" has been a popular expression since about 1700. |
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