The Collaborative International Dictionary of English v.0.48:

throw away \throw away\ v. t.
   1. to discard.
      [PJC]

   2. to waste or squander.
      [PJC]
      [1913 Webster]

WordNet (r) 3.0 (2006):

throw 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]
    2: 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]