break down Synonyms

crumple give out decompose crumble collapse conk out take apart break die go bad dissect fail tear down misfire choke up fall over go to pieces play up fall flat fall short malfunction backfire go wrong knock down pull down come apart fall apart crack up give way fall through wear and tear turn on the waterworks underachieve be defeated be frustrated be in vain not come up to scratch lack success meet with disaster not succeed powderize underperform freak out bite the dust come a cropper come to grief come to naught come to nothing fizzle out go astray