muma.[Of imitative origin. Cf. Mumble.] Silent; not speaking; as, to keep mum.(Thackeray.)The citizens are mum, and speak not a word. (Shak.)mum's the word keep this a secret; don't tell anybody.()interj. Be silent! Hush!()Mum, then, and no more. (Shak.)n. Silence.(Hudibras.)n.[G. mummere, fr. Christian Mumme, who first brewed it in 1492.] A sort of strong beer, originally made in Brunswick, Germany.(Addison.)The clamorous crowd is hushed with mugs of mum. (Pope.)