1. n. Brit. colloq. mother.
Etymology: abbr. of MUMMY(1) 2. adj. colloq. silent (keep mum).
Phrases and idioms:
mum's the word say nothing.
Etymology: ME: imit. of closed lips 3. v.intr. (mummed, mumming) act in a traditional masked mime.
Etymology: cf. MUM(2) and MLG mummen