Mumm (?), v. i. [imp. & p. p. Mummed (?); p. pr. & vb. n. Mumming.] [D. mimmen to mask, mom a mask; akin to G. mumme disguise; prob. of imitative origin, and akin to E. mum, mumble, in allusion to the indistinctness of speech occasioned by talking from behind a mask. Cf. Mumble, Mummery.]
To sport or make diversion in a mask or disguise; to mask.
With mumming and with masking all around.
© Webster 1913.