[1] : WordNet (r) 2.0

give up
     v 1: lose or lose the right to by some error, offense, or crime
          syn: forfeit, throw overboard, waive, forgo
          ant: claim
     2: give up with the intent of never claiming again; "abandon
        your life to god"; "she gave up her children to her
        ex-husband when she moved to tahiti"; "we gave the
        drowning victim up for dead" syn: abandon
     3: give up in the face of defeat of lacking hope; admit defeat;
        "in the second round, the challenger gave up" syn: drop
        out, fall by the wayside, drop by the wayside, throw
        in, throw in the towel, quit, chuck up the sponge
        ant: enter
     4: put an end to a state or an activity; "quit teasing your
        little brother" syn: discontinue, stop, cease, quit,
         lay off ant: continue
     5: give up what is not strictly needed; "he asked if they could
        spare one of their horses to speed his journey" syn: spare,
         part with, dispense with
     6: part with a possession or right; "i am relinquishing my
        bedroom to the long-term house guest"; "resign a claim to
        the throne" syn: release, relinquish, resign, free
     7: leave a job, post, post, or position voluntarily; "she
        vacated the position when she got pregnant"; "the chairman
        resigned when he was found to have misappropriated funds"
        syn: vacate, resign, renounce
     8: relinquish possession or control over; "the squatters had to
        surrender the building after the police moved in" syn: surrender,
         cede, deliver
     9: give up or agree to forego to the power or possession of
        another; "the last taleban fighters finally surrendered"
        syn: surrender ant: resist
     10: stop maintaining or insisting on; of ideas, claims, etc.;
         "he abandoned the thought of asking for her hand in
         marriage"; "both sides have to give up some calims in
         these negociations" syn: abandon
     11: allow the other baseball team to score; "give up a run"
         syn: allow
     12: refrain from consuming; "you will have to forgo alcohol"
         syn: forgo
see also:
forfeit throw overboard waive forgo claim abandon 
drop out fall by the wayside drop by the wayside throw in throw in the towel 
quit chuck up the sponge enter discontinue stop 
cease lay off continue spare part with 
dispense with release relinquish resign free 
vacate renounce surrender cede deliver 
resist allow 

[2] : Moby Thesaurus II by Grady Ward, 1.0

111 moby thesaurus words for "give up":
   abandon, abandon hope, abdicate, abjure, acknowledge defeat,
   back down, be at sea, be innocent of, be lost, be pensioned,
   be superannuated, break off combat, break the habit, cave in,
   cease, cease resistance, cede, come off, coquet with, cry quits,
   cut out, dabble, demit, desist, desist from, despair, despair of,
   despond, discontinue, disgorge, dispense with, dispose of, disuse,
   do without, drop, dump, falter, forgo, forswear, get along without,
   get rid of, give away, give ground, give in, give over,
   give up hope, give way, hand, hand over, have done with,
   have no idea, kick, kiss good-bye, know a little, know not,
   know not what, know nothing of, lay down, leave, leave off, let go,
   lose heart, lose hope, make a sacrifice, make nothing of, nol-pros,
   not know, not pursue with, not rightly know, not understand,
   part with, pass, pension off, put behind one, quit, quit the field,
   quitclaim, recant, relinquish, render up, renounce,
   renounce the throne, resign, retire, retire from office, retract,
   sacrifice, scratch the surface, shake, sink into despair, smatter,
   spare, stand aside, stand down, step aside, stop, superannuate,
   surrender, swear off, take the pledge, throw off, throw up,
   toy with, vacate, waive, withdraw from, wonder, wonder whether,
   wot not of, yield, yield to despair

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