WordNet (r) 3.0 (2006):

beat back
    v 1: cause to move back by force or influence; "repel the
         enemy"; "push back the urge to smoke"; "beat back the
         invaders" [syn: repel, drive, repulse, force back,
         push back, beat back] [ant: attract, draw, draw
         in, pull, pull in]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "beat back":
   brush off, chase, chase away, chase off, cut, dismiss, drive away,
   drive back, fend off, hold off, keep off, pack off, push back,
   put back, rebuff, refuse, repel, repulse, send away, send off,
   send packing, snub, spurn, thrust back, turn back, ward off