Definitions for keep mum
ADVERTISEMENT
Princeton's WordNet
close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum(verb)
refuse to talk or stop talking; fall silent
"The children shut up when their father approached"
Wiktionary
keep mum(Verb)
To not talk; especially keep silent about something that may be sensitive or secret.
Citation
Use the citation below to add this definition to your bibliography:
"keep mum." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/keep mum>.

