WordNet (r) 3.0 (2006):

egg on
    v 1: urge on; cause to act; "The other children egged the boy
         on, but he did not want to throw the stone through the
         window" [syn: prod, incite, egg on]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "egg on":
   agitate, arouse, cheer on, drive, drive on, excite, exhort, goad,
   goad on, hasten on, hie on, hound on, hurry on, instigate, pique,
   prick, prod, prompt, propel, rally, root on, sic, speed on, spur,
   spur on, stimulate, stir up, urge on, whip, whip on