Nub \Nub\, v. t. [Cf. Knob.] To push; to nudge; also, to beckon. [Prov. Eng.]
Source: Webster's Revised Unabridged Dictionary (1913)
Nub \Nub\, n. A jag, or snag; a knob; a protuberance; also, the point or gist, as of a story. [Colloq.]