Source : Webster's Revised Unabridged Dictionary (1913)

Nudge \Nudge\, v. t. [imp. & p. p. {Nudge?}; p. pr. & vb. n.
   {Nudging}.] [Cf. Prov. G. kn["u]tschen to squeeze, pinch, E.
   Knock.]
   To touch gently, as with the elbow, in order to call
   attention or convey intimation.