keep mum
Verb
Meaning
refuse to talk or stop talking; fall silent
Source: WordNetSynonyms
shut up
clam up
be quiet
hush
shush
close up
pipe down
keep quiet
quieten
button up
hush up
belt up
dummy up
keep schtum
be silent
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Antonyms
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Living in the fishbowl is hard enough without worrying about a Secret Service that can't keep mum.
There's a shop on the next corner, North Six, between Wythe and Berry? I'd like you all to go smash it up. Now, if anyone asks you who told you to do this, I want you to keep mum. It was Franz.
The children shut up when their father approached