WordReference Random House Learner's Dictionary of American English © 2017
mum1 /mʌm/USA pronunciation   adj. 
  1. silent:to keep mum.

mum3 /mʌm/USA pronunciation   n. 
  1. Plant Biologychrysanthemum.

WordReference Random House Unabridged Dictionary of American English © 2017
mum1  (mum),USA pronunciation adj. 
  1. silent;
    not saying a word:to keep mum.

  1. say nothing! be silent!
  2. Idiomsmum's the word, do not reveal what you know (about something);
    keep silent:Mum's the word, or the surprise party won't be a surprise.
  • 1350–1400; Middle English momme; imitative

mum2  (mum),USA pronunciation v.i.,  mummed, mum•ming. 
  1. to say "mum'';
    call for silence.
  2. to act as a mummer.
Also,  mumm. 
  • 1350–1400; Middle English mommen, verb, verbal use of mum1; compare Middle Dutch mommen to act the mummer's part

mum3  (mum),USA pronunciation n. 
  1. Plant Biologychrysanthemum.
  • shortened form

mum4  (mum),USA pronunciation n. [Chiefly Brit.]
  1. British Termsmother.
  • 1815–25; nursery word; see mom

mum5  (mum),USA pronunciation n. 
  1. Winea strong beer or ale, first made in Brunswick, Germany.
  • German Mumme, said to have been named after the brewer who made it
  • 1630–40

mum6  (mum),USA pronunciation n. [Chiefly Brit.]
  1. British Termsmadam.
  • variant of ma'am

Collins Concise English Dictionary © HarperCollins Publishers::

mum /mʌm/ n
  1. chiefly Brit
    an informal word for mother1
Etymology: 19th Century: a child's word
mum /mʌm/ adj
  1. keeping information to oneself; silent
  1. mum's the wordsilence or secrecy is to be observed
Etymology: 14th Century: suggestive of closed lips
mum, mumm /mʌm/ vb (mums, mumming, mummed)
  1. (intransitive) to act in a mummer's play
Etymology: 16th Century: verbal use of mum²

'mum' also found in these entries:

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