Mum

[muhm] /mʌm/

adjective
1.
silent; not saying a word:
to keep mum.
interjection
2.
say nothing! be silent!
Idioms
3.
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.
[muhm] /mʌm/
verb (used without object), mummed, mumming.
1.
to say “mum”; call for silence.
2.
to act as a mummer.
[muhm] /mʌm/
noun
1.
.
[muhm] /mʌm/
noun, Chiefly British.
1.
1 .
[muhm] /mʌm/
noun
1.
a strong beer or ale, first made in Brunswick, Germany.
[muhm] /mʌm/
noun, Chiefly British.
1.
.
/mʌm/
noun
1.
(mainly Brit) an informal word for mother1
/mʌm/
adjective
1.
keeping information to oneself; silent
noun
2.
mum’s the word, silence or secrecy is to be observed
/mʌm/
verb mums, mumming, mummed
1.
(intransitive) to act in a mummer’s play
/mʌm/
noun
1.
(Brit, obsolete) a type of beer made from cereals, beans, etc
interj.

“be silent,” 1560s, from Middle English mum, mom (late 14c.), inarticulate closed-mouth sound, indicative of unwillingness or inability to speak. As an adjective meaning “secret” from 1520s. Phrase mum’s the word is first recorded 1704.
n.

abbreviation of chrysanthemum, first attested 1915 in the jargon of gardeners.

pet word for “mother,” 1823, short for mummy (see mamma). In British sociology, used from 1957 in reference to “the working class mother as an influence in the lives of her children.” Also sometimes a vulgar corruption of madam.