run down vs conk out

run down and conk out both are verbs.

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

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

run down and conk out: use up all one's strength and energy and stop working

Other synonyms of run down include peter out, poop out, run out.

run down (verb)	conk out (verb)
use up all one's strength and energy and stop working	use up all one's strength and energy and stop working
injure or kill by knocking (someone or something) down and passing over the body, as with a vehicle	stop operating or functioning
pursue until captured
move downward
examine hastily
deplete
trace