break down vs go down

break down and go down both are verbs.

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

As verbs, go down is a hyponym of break down; that is, go down is a word with a more specific, narrower meaning than break down:

Other hyponyms of break down include crash, blow, blow out, burn out, misfire, malfunction, misfunction.

break down (verb)	go down (verb)
collapse due to fatigue, an illness, or a sudden attack	grow smaller
stop operating or functioning	stop operating
separate (substances) into constituent elements or parts	be defeated
make a mathematical, chemical, or grammatical analysis of; break down into components or essential features	be ingested
make ineffective	go under
cause to fall or collapse	disappear beyond the horizon
lose control of one's emotions	move downward and lower, but not necessarily all the way
fall apart	be recorded or remembered