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3. keep mum

Wiktionary

keep mum

vb. (context idiomatic English) To not talk; especially keep silent about something that may be sensitive or secret.

WordNet

keep mum

v. refuse to talk or stop talking; fall silent; "The children shut up when their father approached" [syn: close up, clam up, dummy up, shut up, belt up, button up, be quiet] [ant: open up]