break down vs conk out

break down and conk out both are verbs.

Word	Noun	Adjective	Verb	Adverb
break down	No	No	Yes	No
conk out	No	No	Yes	No

As verbs, break down and conk out are synonyms defined as:

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

break down (verb)	conk out (verb)
collapse due to fatigue, an illness, or a sudden attack	use up all one's strength and energy and stop working
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