Synonyms and related words :
abort, backslide, be disappointing, be in error, be mistaken, be wrong, break down, come short, conk out, degenerate, deviate, err, fall, fall into error, fall short, fizzle, fizzle out, give out, go amiss, go astray, go awry, go haywire, go kaput, go to glory, go to hell, go to perdition, go to pot, go to ruin, go to shivers, go to smash, go to smithereens, go under, go up, lapse, misbelieve, miscalculate, miscarry, not hack it, not make it, pack up, peter out, serve Mammon, slip, slip up, stray, stumble, trip, turn sour, wander