stay mum
Don't say anything
Stay mum means to remain silent, especially about something you know but shouldn't reveal: Just stay mum about the surprise party.
The phrase implies deliberate secrecy rather than having nothing to say.
Mum here is an old word for silence, related to the closed-lip sound "mmm."
- keep quietRemain silent
- concealKeep from being seen
- tight-lippedUnwilling to divulge
- lips sealedPledged to secrecy
- secrecyPractice of hiding information
silent · hush · not a word · bite your tongue · reticent · guarded · withhold · unspoken · poker-faced · clam up · confidentiality · sworn to secrecy · zip it · discretion · button it · mute · uncommunicative · unsaid
verbal disclosure
stay mumblab
Divulge indiscreetly
spill the beans · tell all · let the cat out of the bag · break silence · divulge
communicative volume/frequency
stay mumrun one's mouth
Talk excessively, indiscreetly
talk someone's ear off · chatter · jabber · prattle · gab