WordNet (r) 3.0 (2006):

call off
    v 1: postpone indefinitely or annul something that was
         scheduled; "Call off the engagement"; "cancel the dinner
         party"; "we had to scrub our vacation plans"; "scratch that
         meeting--the chair is ill" [syn: cancel, call off,
         scratch, scrub]
    2: give the calls (to the dancers) for a square dance [syn:
       call, call off]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "call off":
   KO, call over, call the roll, cancel, census, complete, count,
   delete, dispose of, drop, drop the curtain, end off, enumerate,
   expunge, extinguish, finalize, finish, fold up, foliate,
   get it over, get over with, get through with, give the quietus,
   kayo, kibosh, kill, knock out, measure, number, numerate, page,
   paginate, perfect, polish off, poll, put paid to, quantify,
   quantize, run over, scrag, scrub, shoot down, tally, tell,
   wipe out, zap