Source : Webster's Revised Unabridged Dictionary (1913)

Nubble \Nub"ble\, v. t. [Cf. LG. nubben to knock, cuff.]
   To beat or bruise with the fist. [Obs.] --Ainsworth.

Source : WordNet®

nubble
     n : a small lump or protuberance [syn: {nub}]