RhymeZone: mump definitions

Definitions of mump:

verb: (transitive, intransitive) To mumble, speak unclearly.
verb: To move the lips with the mouth closed; to mumble, as in sulkiness.
verb: (intransitive) To beg, especially if using a repeated phrase.
verb: To deprive of (something) by cheating; to impose upon.
verb: To cheat; to deceive; to play the beggar.
verb: To be sullen or sulky.
verb: (transitive, intransitive) To nibble.
verb: (Of a police officer) to accept a small gift or bribe in exchange for services.
noun: (obsolete) A grimace.
noun: (UK, dialect, Somerset) A cube of peat; a spade's depth of digging turf.

(Definitions from Wiktionary)