Usually means: Remain silent; disclose no information.
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We found 14 dictionaries that define the word keep mum:

General (14 matching dictionaries)
  1. keep mum: Merriam-Webster
  2. keep mum: Dictionary.com
  3. keep mum: Rhymezone
  4. keep mum: FreeDictionary.org
  5. keep mum: Mnemonic Dictionary
  6. keep mum: TheFreeDictionary.com
  7. Keep mum: World Wide Words
  8. keep mum: Oxford Learner's Dictionaries
  9. keep mum: Vocabulary.com
  10. keep mum: Cambridge Advanced Learner's Dictionary
  11. keep mum: Wiktionary
  12. keep mum: Longman Dictionary of Contemporary English

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Definitions from WordNet (keep mum)

▸ verb:  refuse to talk or stop talking; fall silent

Similar:
close up, dummy up, shut up, clam up, belt up, button up, be quiet, keep quiet, hold one's tongue, keep one's mouth shut, more...

Opposite:
speak up, divulge, reveal, disclose, confess

Phrases:
don't keep mum, more...

▸ Words similar to keep mum

▸ Usage examples for keep mum

▸ Idioms related to keep mum

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▸ Words that often appear near keep mum

▸ Rhymes of keep mum

▸ Invented words related to keep mum

Similar:
close up, dummy up, shut up, clam up, belt up, button up, be quiet, keep quiet, hold one's tongue, keep one's mouth shut, more...

Opposite:
speak up, divulge, reveal, disclose, confess

Phrases:
don't keep mum, more...



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