check up on vs check out

check up on and check out both are verbs.

Word	Noun	Adjective	Verb	Adverb
check up on	No	No	Yes	No
check out	No	No	Yes	No

As verbs, check up on and check out are synonyms defined as:

check up on and check out: examine so as to determine accuracy, quality, or condition

Other synonyms of check up on include check, check into, check over, go over, look into, suss out.

check up on (verb)	check out (verb)
examine so as to determine accuracy, quality, or condition	examine so as to determine accuracy, quality, or condition
	announce one's departure from a hotel
	try to learn someone's opinions and intentions
	record, add up, and receive payment for items purchased
	withdraw money by writing a check
	trace
	be verified or confirmed; pass inspection