Adjective mum has 1 sense
- mum, silent - failing to speak or communicate etc when expected to; "the witness remained silent"
Antonyms: communicative, communicatory (indirect, via uncommunicative)
,
Noun mum has 3 senses
- florist's chrysanthemum, florists' chrysanthemum, mum, Dendranthema grandifloruom, Chrysanthemum morifolium - of China
--1 is a kind of chrysanthemum
- ma, mama, mamma, mom, momma, mommy, mammy, mum, mummy, mater - informal terms for a mother
--2 is a kind of mother, female parent
- mum - secrecy; "mum's the word"
--3 is a kind of secrecy, secretiveness, silence
,