mum's the word

idiom

Definition of mum's the word

informal
used to say that some information is being kept secret or should be kept secretWe want her birthday party to be a surprise, so mum's the word.

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“Mum's the word.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mum%27s%20the%20word. Accessed 5 Dec. 2020.

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