beat blow blow up break break down burn out cave in collapse come apart come to naught come to nothing come unstuck conk out crack up crumble debilitate decline disintegrate do in do up droop drop enervate exhaust explode fade fag fag out fail fail miserably faint fall down fall flat fall through fatigue fizz out fizzle fizzle out flag frazzle gasp get bogged down get hung up get mired get nowhere get tired give out give way go downhill go phut go soft go to pieces grow weary hang up harass hit the skids jade knock out knock up languish misfire overfatigue overstrain overtire overweary pant peg out peter out pine play out poop prostrate puff puff and blow run down run out sink succumb tire tire out tire to death tucker use up weaken wear wear away wear down wear on wear out wear thin weary wheeze wilt wind yield