intransitive verb
1
dialectal, England
: to grimace with the mouth : grin
3
dialectal, England
: to be sullen or sulky
make a shift at bearing yourself like a man, not mumping, not moping—J. G. Cozzens
transitive verb
chiefly dialectal
: cheat
some debauched person who will mump you of your daughter—William Wycherley
intransitive verb
1
dialectal, England
: beg, sponge
one prince came mumping to them annually—T. B. Macaulay
2
dialectal, England
: cheat
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Merriam-Webster unabridged
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