not tell, keep quiet, remain silent
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Keep mum Definition from Language, Idioms & Slang Dictionaries & Glossaries
keep mum
keep out v : prevent from entering; shut out; "the trees were shutting out all sunlight"; "this policy excludes people who have a criminal record from entering the country" [syn: exclude, shut out, shut]
[ant: admit]
Verb
1. refuse to talk or stop talking; fall silent; "The children shut up when their father approached"
(synonym) close up, clam up, dummy up, shut up, belt up, button up, be quiet
