break down vs go bad

break down and go bad both are verbs.

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

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

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

break down (verb)	go bad (verb)
collapse due to fatigue, an illness, or a sudden attack	become unfit for consumption or use
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