#1 mum s. [silent] failing to speak or communicate etc when expected to; "the witness remained silent". wn
#2 mum n. [florist's chrysanthemum, florists' chrysanthemum, Dendranthema grandifloruom, Chrysanthemum morifolium] of China. wn
#3 mum n. [ma, mama, mamma, mom, momma, mommy, mammy, mummy] informal terms for a mother. wn
#4 mum n. secrecy; "mum's the word". wn
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