sweep up vs fasten on

sweep up and fasten on both are verbs.

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

As verbs, fasten on is a hyponym of sweep up; that is, fasten 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
fasten on: adopt

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

sweep up (verb)	fasten 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