mum
nounMother.
intransitive verbTo act or play in a pantomime.
intransitive verbTo go merrymaking in a mask or disguise especially during a festival.
nounA strong beer originally brewed in Brunswick, Germany.
adjectiveNot verbalizing; silent.
interjectionUsed as a command to stop speaking.
idiom(mum’s the word) Say nothing of the secret you know.
nounA chrysanthemum.
Silent.
To be silent; keep silence.