MUMP
Source: 566, 567
mump. Mump, v.t. to nibble, speak low and quick, ob.
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Mump (?), v. i. [[Akin to mumble; cf. D. mompen to cheat; perh. orig., to whine like a beggar, D. mompelen to mumble. See Mumble, Mum, and cf. Mumps.]] 1. 1. To move the lips with the mouth closed; to mumble, as in sulkiness.
He mumps, and lovers, and hangs the lip. Taylor, 1630. 2. 2. To talk imperfectly, brokenly, or feebly; to chatter unintelligibly.
3. 3. To cheat; to deceive; to play the beggar.
And then when mumping with a sore leg, . . . canting and whining. Burke. 4. 4. To be sullen or sulky.