go bad vs break down

go bad and break down both are verbs.

Word	Noun	Adjective	Verb	Adverb
go bad	No	No	Yes	No
break down	No	No	Yes	No

As verbs, go bad and break down are synonyms defined as:

Other synonyms of go bad include break, conk out, die, fail, give out, give way, go.

go bad (verb)	break down (verb)
become unfit for consumption or use	collapse due to fatigue, an illness, or a sudden attack
stop operating or functioning	stop operating or functioning
	separate (substances) into constituent elements or parts
	make a mathematical, chemical, or grammatical analysis of; break down into components or essential features
	make ineffective
	cause to fall or collapse
	lose control of one's emotions
	fall apart