roll up vs gather in

roll up and gather in both are verbs.

Word	Noun	Adjective	Verb	Adverb
roll up	No	No	Yes	No
gather in	No	No	Yes	No

As verbs, gather in is a hyponym of roll up; that is, gather in is a word with a more specific, narrower meaning than roll up:

Other hyponyms of roll up include douse, reef, bolt, take in, brail.

roll up (verb)	gather in (verb)
form a cylinder by rolling	fold up
form into a cylinder by rolling
show certain properties when being rolled
make into a bundle
close (a car window) by causing it to move up, as with a handle
arrive in a vehicle:
get or gather together