Mumm
Mumm , intransitive verb
[Dutch mimmen to mask, mom a mask; akin to German mumme disguise; prob. of imitative origin, and akin to English mum, mumble, in allusion to the indistinctness of speech occasioned by talking from behind a mask. Compare Mumble, Mummery.]
To sport or make diversion in a mask or disguise; to mask.
With mumming and with masking all around.