fasten on vs sweep up

fasten on and sweep up both are verbs.

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

As verbs, sweep up is a hypernym of fasten on; that is, sweep up is a word with a broader meaning than fasten on:

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

Other hypernyms of fasten on include adopt, embrace, espouse.

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