英語博客-北美風(fēng)情 73、Expression: Mum’s the word
If you want to tell someone to keep something a secret or promise to keep a secret for someone else you can use this expression: mum’s the word. At first it seems like a strange expression…mum is the word? Weird. But you will see it is not so complicated when we explain the possible origin of this expression and the meaning of mum.
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