keep mum

(redirected from keep mum about it)
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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

keep mum

remain silent about something; not reveal a secret. informal
See also: keep, mum

keep ˈmum

(informal) say nothing about a secret; stay silent: I just kept mum when she asked me where Ben was. She’d be furious if she knew.Please will everyone keep mum about Saturday. We want to give them a real surprise. OPPOSITE: blow the gaff (on somebody/something)
See also: keep, mum