WordNet (r) 3.0 (2006):

cast off
    v 1: get rid of; "he shed his image as a pushy boss"; "shed your
         clothes" [syn: shed, cast, cast off, shake off,
         throw, throw off, throw away, drop]
    2: make the last row of stitches when knitting [ant: cast on]

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "cast off":
   abandon, abandoned, abrupt, abstract, adrift, afloat, alienate,
   aweigh, break ground, cast, cast aside, cast away, cast loose,
   cast out, castaway, cat the anchor, chuck, clear, clear away,
   clear out, clear the decks, cut adrift, cut off, cut out, deep-six,
   delete, depart, deport, derelict, detach, disarticulate, discard,
   discarded, disconnect, disengage, disjoin, disjoint, disowned,
   dispel, dispose of, dissociate, disunite, ditch, divide, divorce,
   do away with, doff, douse, drop, drop the mooring, dump,
   eighty-six, eject, elide, eliminate, eradicate, estrange, exile,
   expatriate, expel, exterminate, fling off, forsaken, free,
   get quit of, get rid of, get shut of, give away, isolate, jettison,
   jilt, leave, liberate, liquidate, loose, loose for sea, loosen,
   outcast, outlaw, outside the gates, outside the pale, part,
   part with, pick out, pull away, pull back, pull out, purge,
   put off, reject, rejected, release, remove, root out, root up,
   segregate, separate, sequester, set apart, set aside, shake off,
   shoo, shut off, slip out of, slough, split, stand aloof,
   stand apart, stand aside, started, step aside, step out of,
   strike off, strike out, subtract, take off, throw away, throw off,
   throw out, throw over, throw overboard, toss overboard, unanchored,
   unbar, unbind, unbolt, unbuckle, unbutton, unchain, unclasp,
   uncouple, undo, unfasten, unfetter, unglue, unlace, unlatch,
   unleash, unlock, unloose, unloosen, unmoor, unmoored, unstick,
   unstrap, untie, untied, unwrap, unyoke, up-anchor, weed out,
   weigh anchor, withdraw