suss out vs check up on

suss out and check up on both are verbs.

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

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

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

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

suss out (verb)	check up on (verb)
examine so as to determine accuracy, quality, or condition	examine so as to determine accuracy, quality, or condition