mum's the word
idiom
informal
—used to say that some information is being kept secret or should be kept secret
We want her birthday party to be a surprise, so mum's the word.
Examples of mum's the word in a Sentence
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As of right now, mum's the word on the plot for season 6.
—
Adrianna Freedman, Good Housekeeping, 18 June 2023
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Adrianna Freedman, Good Housekeeping, 18 June 2023
Cite this Entry
“Mum's the word.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mum%27s%20the%20word. Accessed 4 May. 2025.
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