WordNet (r) 3.0 (2006):

cast away
    v 1: throw or cast away; "Put away your worries" [syn:
         discard, fling, toss, toss out, toss away, chuck
         out, cast aside, dispose, throw out, cast out,
         throw away, cast away, put away]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "cast away":
   abandon, beach, blow, break ground, cast, cast aside, cast loose,
   cast off, cat the anchor, chuck, consume, deep-six, discard,
   dispose of, dissipate, ditch, drop the mooring, dump, eighty-six,
   eliminate, fool away, fritter, get quit of, get rid of,
   get shut of, give away, ground, jettison, jilt, loose for sea,
   part with, pile up, reject, remove, run aground, shipwreck, slough,
   squander, strand, take the ground, throw away, throw out,
   throw over, throw overboard, toss overboard, trifle away, unmoor,
   up-anchor, weigh anchor, wreck