Meaning of “mum's the word” in the English Dictionary

british dictionary

"mum's the word" in British English

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mum's the word

saying

said when you tell someone, or agree with someone, to keep something a secret:

"I'm not telling people generally yet." "OK, mum's the word!"

(Definition of “mum's the word” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)