expire vs break down

expire and break down both are verbs.

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

expire (verb)	break down (verb)
expel air	collapse due to fatigue, an illness, or a sudden attack
pass from physical life and lose all bodily attributes and functions necessary to sustain life	stop operating or functioning
lose validity	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