There are 4 definitions of mum in English:

mum1

Syllabification: mum
Pronunciation: /məm
 
/

adjective

Silent.
More example sentences
  • They kept their engagement and pregnancy mum for months.
  • Well the most wonderful thing happened last night, but I have to be mum on the subject, so I can't say a word.
  • However, his doctors are still remaining mum on his condition until the complete tests take place later this week.

Origin

late Middle English: imitative of a sound made with closed lips.

Phrases

keep mum

informal Remain silent, especially so as not to reveal a secret: he was keeping mum about a possible move to Canada
More example sentences
  • Think what you may; keeping mum gives me one secret more.
  • A good friend can keep mum about your deepest darkest secrets.
  • The CIA though has conveniently kept mum as of now.

mum's the word

informal (As a request or warning) say nothing; don’t reveal a secret.
More example sentences
  • Go out and have some fun, but remember, mum's the word!
  • But the best thing of all about all the hand-outs in this welfare state is that mum's the word, when it comes to explaining to taxpayers why you need their money.
  • The mystery is certainly captivating Washington, while mum's the word at the White House.
Synonyms
say nothing, keep quiet, don't breathe a word, don't tell a soul, keep it secret, keep it to yourself, keep it under your hat
informal don't let on, don't let the cat out of the bag

Definition of mum in:

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There are 4 definitions of mum in English:

mum2

Syllabification: mum
Pronunciation: /məm
 
/

verb (mums, mumming, mummed)

[no object]
Act in a traditional masked mime or a mummers' play.
More example sentences
  • He was the first to draw scholarly attention to the custom of Christmas mumming in Newfoundland and its accompanying traditional drama, as evidenced in the standard work on the subject, Christmas Mumming in Newfoundland.
  • It's an old tradition, which, along with wassailing and mumming, we have performed over the years in and around Skipton, and many people, especially those young in heart, enjoy the music and dance in which all are invited to participate.
  • The common and consistent point is that they took a selection of historic performance practices - morris dances and sword dances, mumming, and others in England - and declared them to be the survivals of ancient sacrificial rituals.

Origin

late Middle English: compare with mum1 and Middle Low German mummen.

Definition of mum in:

There are 4 definitions of mum in English:

mum3

Syllabification: mum
Pronunciation: /məm
 
/

noun

informal
A cultivated chrysanthemum.
More example sentences
  • Whether you want to compete or simply collect mums, the National Chrysanthemum Society has 43 chapters across the country.
  • Saint Mary's Church was decorated with pink and white mums.
  • Autumn's butterflies - fritillaries and migrating monarchs - match the burnt-orange mums just beginning to bloom.

Origin

late 19th century: abbreviation.

Definition of mum in:

There are 4 definitions of mum in English:

mum4

Syllabification: mum
Pronunciation: /məm
 
/

noun

British term for mom.

Origin

mid 17th century: abbreviation of mummy2.

Definition of mum in: