silent; not saying a word: to keep mum.
(used to demand immediate silence.)
Idioms about mum
mum'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.
Other definitions for mum (2 of 6)
to say “mum”; call for silence.
to act as a mummer.
Other definitions for mum (3 of 6)
Other definitions for mum (4 of 6)
Other definitions for mum (5 of 6)
a strong beer or ale, first made in Brunswick, Germany.
How to use mum in a sentence
Wee Róisín Murphy has no idea her sister is actually her mum.
If I didn’t have my brothers doing what they do for me, and my mum doing what she does for me, it wouldn’t feel normal.After growing up poor, a Premier League star corners U.K. into feeding its hungry | Amos Barshad | November 30, 2020 | Washington Post
The enterprising lady followed the mumming company through the gate in the white paling, and stood before the open porch.Return of the Native | Thomas Hardy
The Fool (Motley: with a bauble long enough to put over his shoulder and be held by the one behind in the mumming circle).The Peace Egg and Other tales | Juliana Horatia Ewing
English Wat, attend me alone, and the rest of you end your revelry, and doff your mumming habits.The Fair Maid of Perth | Sir Walter Scott
British Dictionary definitions for mum (1 of 4)
mainly British an informal word for mother 1
British Dictionary definitions for mum (2 of 4)
keeping information to oneself; silent
mum's the word silence or secrecy is to be observed
British Dictionary definitions for mum (3 of 4)
(intr) to act in a mummer's play
British Dictionary definitions for mum (4 of 4)
British obsolete a type of beer made from cereals, beans, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012