keep mum

(redirected from keep it mum)
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keep mum

To remain silent; to not say anything (e.g., about a secret). Make sure you kids keep mum in there or you're both grounded! You have to keep mum about Dave's retirement party—we want it to be a surprise.
See also: keep, mum
References in classic literature ?
And even if they did, they wouldn't know who it was and they's keep it mum for me.