WordNet (r) 3.0 (2006):

go off
    v 1: run away; usually includes taking something or somebody
         along; "The thief made off with our silver"; "the
         accountant absconded with the cash from the safe" [syn:
         abscond, bolt, absquatulate, decamp, run off, go
         off, make off]
    2: be discharged or activated; "the explosive devices went off"
    3: go off or discharge; "The gun fired" [syn: fire,
       discharge, go off]
    4: stop running, functioning, or operating; "Our power went off
       during the hurricane" [ant: come on, come up, go on]
    5: happen in a particular manner; "how did your talk go over?"
       [syn: go off, come off, go over]
    6: burst inward; "The bottle imploded" [syn: implode, go
       off] [ant: burst, explode]

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "go off":
   aberrate, avert, backfire, bang, bark, be blooded, be found,
   be getting along, be met with, be realized, be successful,
   bear off, befall, betide, blast, blow, blow out, blow up, burst,
   bust, buzz off, catch on, click, come, come about, come away,
   come down, come off, come to pass, come true, connect, crack,
   decline, depart, deploy, detonate, die, discharge, divaricate,
   diverge, divide, draw aside, ease off, ebb, edge off, eventuate,
   exit, explode, fade, fail, fall, fall away, fall off, fan out,
   farewell, fire, fly off, fulminate, gang along, gee, get along,
   get away, get off, get on, get under way, glance, glance off, go,
   go along, go away, go down, go downhill, go great guns, go on,
   go over, go over big, go to town, graduate, hap, happen, haw,
   head off, hit a slump, hit rock bottom, hit the skids, jib, lapse,
   leave, let off, make a hit, make way for, march off,
   meet with success, mosey, move aside, move away, move off,
   move out, mushroom, occur, outspread, pass, pass off, pop, prevail,
   prosper, pull out, qualify, reach the depths, run down, sashay,
   sashay off, separate, set off, sheer off, shoot, shove aside,
   shunt, shy, shy off, side, sidestep, sidetrack, sidle, sink, slide,
   slip, slump, splay, spread, stagger along, steer clear of,
   step aside, subside, succeed, switch, take, take flight,
   take place, take wing, toddle along, touch bottom, touch off,
   transpire, turn aside, turn away, turn back, up and go, veer off,
   wane, wing it, work well, work wonders