WordNet (r) 3.0 (2006):

pull back
    v 1: pull back or move away or backward; "The enemy withdrew";
         "The limo pulled away from the curb" [syn: withdraw,
         retreat, pull away, draw back, recede, pull back,
         retire, move back] [ant: advance, go on, march
         on, move on, pass on, progress]
    2: use a surgical instrument to hold open (the edges of a wound
       or an organ) [syn: retract, pull back, draw back]
    3: move to a rearward position; pull towards the back; "Pull
       back your arms!"
    4: stretch back a bowstring (on an archer's bow); "The archers
       were drawing their bows" [syn: pull back, draw]
    5: make a retreat from an earlier commitment or activity; "We'll
       have to crawfish out from meeting with him"; "He backed out
       of his earlier promise"; "The aggressive investment company
       pulled in its horns" [syn: retreat, pull back, back
       out, back away, crawfish, crawfish out, pull in one's
       horns, withdraw]

Moby Thesaurus II by Grady Ward, 1.0:

151 Moby Thesaurus words for "pull back":
   about the bush, abrupt, alienate, avoid, back down, back out,
   backslide, balance, beat a retreat, beat around, beg the question,
   blench, blink, boggle, cast off, cast out, cock, cringe,
   cut adrift, cut off, cut out, debate, delete, deliberate, demur,
   depart, disarticulate, disconnect, disengage, disjoin, disjoint,
   dissociate, disunite, divide, divorce, dodge, draw back, draw in,
   draw off, duck, eject, equivocate, estrange, evade, expel, fade,
   fall astern, fall back, fall behind, falter, fear, fence,
   fight shy of, flinch, get behind, give ground, give place, go back,
   go backwards, go behind, hang back, hang off, have qualms, hedge,
   hem and haw, hesitate, hold off, hover, hum and haw, isolate,
   jerk back, jib, lapse, leave, lose ground, make bones about,
   move back, parry, part, pause, ponder, pull away, pull in,
   pull out, pussyfoot, put off, quail, recede, recidivate, recoil,
   reel back, regress, relapse, retire, retract, retreat, retrocede,
   retroflex, retrograde, retrogress, return, revert, run back,
   scruple, segregate, separate, sequester, set apart, set aside,
   sheer off, shift, shift off, shilly-shally, shrink, shrink back,
   shut off, shy, shy at, shy away, shy off, sidestep, slip back,
   split, stand aloof, stand apart, stand aside, stand back,
   start aside, start back, step aside, stick at, stickle,
   stop to consider, straddle the fence, strain, strain at, subtract,
   swerve, think twice about, throw off, throw out, turn aside,
   uncouple, unyoke, ward off, waver, weasel, weasel out, wince,
   withdraw, yield