keep/stay mum

idiom

Definition of keep/stay mum

informal
: to not tell anyone (about something) She told him to keep/stay mum about the project.

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Cite this Entry

“Keep/stay mum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%2Fstay%20mum. Accessed 30 Oct. 2020.

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