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Definition of mum : 1. A sort of strong beer, originally made in Brunswick, Germany.
2. Be silent! Hush!
3. Silence.
4. Silent; not speaking.

Synonyms:

mammy, Dendranthema grandifloruom, incommunicative, florists' chrysanthemum, daddy, aster, birth parent, florist's chrysanthemum, mommy, mater, mummy, dad, words, deadbeat dad, bougainvillea, mama, alfalfa, Chrysanthemum Morifolium, father, black-eyed Susan, mom, bluebell, understood, birth father, anemone, uncommunicative, MA, muted, tacit, amaryllis, without a word, mammary gland, fatherhood, unsounded, inarticulate, custodial parent, birth mother, bird of paradise, momma, begonia, wordless, mamma, empty nester, milliampere, baby's breath

silent, mute, speechless, tongue-tied, voiceless, dumb

taciturn, reticent, tight-lipped, un-talkative, reserved, succinct, curt, close-lipped

lulled, noiseless, inaudible, hushed, quiet, still, soundless

Usage examples:

• All right, Lieutenant, go back and keep mum, that's a dear boy, and I'll shuffle into Colonel Hamilton's august presence before many minutes. - "Alice of Old Vincennes", Maurice Thompson.
• " You ain't got much to learn in the way o' guessing, mum," was Bindle's cheery response. - "Adventures of Bindle", Herbert George Jenkins.
• Keep mum about it. - "The Depot Master", Joseph C. Lincoln.