go up vs bear down upon

go up and bear down upon both are verbs.

Word	Noun	Adjective	Verb	Adverb
go up	No	No	Yes	No
bear down upon	No	No	Yes	No

As verbs, bear down upon is a hyponym of go up; that is, bear down upon is a word with a more specific, narrower meaning than go up:

Other hyponyms of go up include drive up, bear down on, edge in, edge up, close, crowd, push.

go up (verb)	bear down upon (verb)
increase in value or to a higher point	sail towards another vessel, of a ship
burn completely; be consumed or destroyed by fire
move upward
go upward with gradual or continuous progress
be erected, built, or constructed
move towards
travel up