Dictionary.com
Thesaurus.com
Synonyms

mum

1 American  
[muhm] / mʌm /

adjective

  1. silent; not saying a word.

    to keep mum.


interjection

  1. (used to demand immediate silence.)

idioms

  1. 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.

mum 2 American  
[muhm] / mʌm /
Or mumm

verb (used without object)

mummed, mumming
  1. to say “mum”; call for silence.

  2. to act as a mummer.


mum 3 American  
[muhm] / mʌm /
mum 4 American  
[muhm] / mʌm /

noun

Chiefly British.
  1. mom.


mum 5 American  
[muhm] / mʌm /

noun

  1. a strong beer or ale, first made in Brunswick, Germany.


mum 6 American  
[muhm] / mʌm /

noun

Chiefly British.
  1. madam.


mum 1 British  
/ mʌm /

adjective

  1. keeping information to oneself; silent

"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

noun

  1. silence or secrecy is to be observed

"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
mum 2 British  
/ mʌm /

noun

  1. an informal word for mother 1

"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

mum 3 British  
/ mʌm /

verb

  1. (intr) to act in a mummer's play

"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

mum 4 British  
/ mʌm /

noun

  1. 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

Usage

What does mum mean? Mum is an adjective that means keeping quiet. It can also be used by itself to mean Be quiet!This sense of mum is especially used in the expressions keep mum and mum’s the word. In the U.K. and other places, mum is used as a word for mom or madam. It’s also commonly used as a short way of saying chrysanthemum, a type of flower.Example: Mum’s keeping mum—I can’t get a word out of her!

Etymology

Origin of mum1

First recorded in 1350–1400; Middle English momme; imitative

Origin of mum2

First recorded in 1350–1400; Middle English mommen, verb use of mum 1; compare Middle Dutch mommen ”to act the mummer's part”

Origin of mum3

First recorded in 1890–95; shortened form

Origin of mum4

First recorded in 1815–25; nursery word; mom

Origin of mum5

First recorded in 1630–40; from German Mumme, said to have been named after Christian Mumme, the brewer who made it

Origin of mum6

Variant of ma'am

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

She is popular at school, has a devoted boyfriend, and lives with a caring mum and adorable younger brother.

From BBC

But the future of mum and all five puppies now looks rosier, thanks to their rescuers.

From BBC

Her mum Paula and dad John realised she had a talent after she took a photo on her mobile of the family dogs running on the beach.

From BBC

I wouldn't wish any mum and dad to lose a child.

From BBC

Having been abandoned by his parents - his dad left before he was born and his mum when he was 14 - he could not prove his status.

From BBC