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.

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.

Nudge \Nudge\, n.
   A gentle push, or jog, as with the elbow.

Source : WordNet®

nudge
     n : a slight push or shake [syn: {jog}]

nudge
     v 1: to push against gently; "She nudged my elbow when she saw
          her friend enter the restaurant" [syn: {poke at}, {prod}]
     2: push into action by pestering or annoying gently