What does "mump" mean?

Mump: To talk imperfectly, brokenly, or feebly; to chatter unintelligibly.

Additional senses

  1. 2.To cheat; to deceive; to play the beggar. And then when mumping with a sore leg, ... canting and whining. Burke.
  2. 3.To be sullen or sulky. [Prov. Eng.]
  3. 4.To utter imperfectly, brokenly, or feebly. Old men who mump their passion. Goldsmith.
  4. 5.To work over with the mouth; to mumble; as, to mump food.
  5. 6.To deprive of (something) by cheating; to impose upon.

Sources