sweep up vs seize on

sweep up and seize on both are verbs.

Word	Noun	Adjective	Verb	Adverb
sweep up	No	No	Yes	No
seize on	No	No	Yes	No

As verbs, seize on is a hyponym of sweep up; that is, seize on is a word with a more specific, narrower meaning than sweep up:

sweep up: take up the cause, ideology, practice, method, of someone and use it as one's own
seize on: adopt

Other hyponyms of sweep up include fasten on, hook on, latch on, take up.

sweep up (verb)	seize on (verb)
take up the cause, ideology, practice, method, of someone and use it as one's own	adopt
force into some kind of situation, condition, or course of action