vi to be sullen or sulky.
2. mump ·vt to utter imperfectly, brokenly, or feebly.
3. mump ·vt to deprive of (something) by cheating; to impose upon.
4. mump ·vi to move the lips with the mouth closed; to mumble, as in sulkiness.
5. mump ·vi to talk imperfectly, brokenly, or feebly; to chatter unintelligibly.
6. mump ·vt to work over with the mouth; to mumble; as, to mump food.
7. mump ·vi to cheat; to deceive; to play the beggar.