Webster's English Dictionary

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mum

1. mum \'m*m\ aj [prob. imit. of a sound made with closed lips] : SILENT 
   {keep ~} - often used interjectionally 
2. mum vt or mummed;  or mum.ming [ME mommen, fr. MF momer to go masked] 1: 
   to act or play usu. in mask or disguise  2: to go about merrymaking in 
   disguise during festivals 
3. mum n [G mumme] : a strong ale or beer 
4. mum n : CHRYSANTHEMUM