| Idiom | mum's the word |
|---|---|
| Meaning | let's keep quiet about this; I agree not to tell anyone about this origin: The word "mum" comes from the murmur "mmmmm," the only sound you can make when your mouth is shut firmly. Try making other sounds besides "mmmmm" with your lips and mouth shut firmly, and you will see that it's impossible! |
| Example | Please don't tell anybody about our new project. Remember: mum's the word! |
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