WordNet (r) 3.0 (2006):

high-tail
    v 1: retreat at full speed; "The actress high-tailed to her
         villa when reporters began to follow her to the restaurant"

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "hightail":
   begone, bound, canter, clear out, cut and run, cut out, decamp,
   flee, fly, fox-trot, gallop, get, git, hop, hop along, hotfoot,
   kite, leap, lope, make tracks, run, run along, run away,
   run away from, run off, scram, skedaddle, spring, sprint, step,
   step along, step lively, take off, take to flight, trip, trot,
   vamoose