WordNet (r) 3.0 (2006):

give away
    v 1: make a gift of; "She gave away her antique furniture"
    2: make known to the public information that was previously
       known only to a few people or that was meant to be kept a
       secret; "The auction house would not disclose the price at
       which the van Gogh had sold"; "The actress won't reveal how
       old she is"; "bring out the truth"; "he broke the news to
       her"; "unwrap the evidence in the murder case" [syn:
       unwrap, disclose, let on, bring out, reveal,
       discover, expose, divulge, break, give away, let
       out]
    3: formally hand over to the bridegroom in marriage; of a bride
       by her father
    4: give away information about somebody; "He told on his
       classmate who had cheated on the exam" [syn: denounce,
       tell on, betray, give away, rat, grass, shit,
       shop, snitch, stag]

Moby Thesaurus II by Grady Ward, 1.0:

125 Moby Thesaurus words for "give away":
   abandon, abjure, arrange a match, babble, be indiscreet,
   be unguarded, bestow, betray, betray a confidence, blab, blabber,
   blurt, blurt out, break, break open, break up, burst, cast,
   cast aside, cast away, cast off, cede, chuck, come apart,
   come unstuck, couple, crack, deep-six, devote, discard, disclose,
   discover, disgorge, disintegrate, dispense with, dispose of, ditch,
   divulge, do without, donate, drop, dump, eighty-six, eliminate,
   fall to pieces, fissure, forgo, forswear, fracture,
   get along without, get quit of, get rid of, get shut of, give up,
   give way, hand out, have done with, hitch, inform, inform on,
   jettison, jilt, join, join together, kiss good-bye, leak, let drop,
   let fall, let slip, make a match, make a sacrifice, make one,
   marry, match, mouth, nuptial, part with, peach, present, quitclaim,
   rat, recant, reject, relinquish, remove, render up, renounce,
   resign, retract, reveal a secret, rupture, sacrifice, sing, slough,
   snap, spare, spill, spill the beans, splice, split, spring a leak,
   squeal, start, stool, surrender, swear off, talk, tattle,
   tattle on, tell, tell on, tell secrets, tell tales, throw away,
   throw out, throw over, throw overboard, throw up, toss overboard,
   unite, unite in marriage, vacate, waive, wed, yield