go down vs get down

go down and get down both are verbs.

Word	Noun	Adjective	Verb	Adverb
go down	No	No	Yes	No
get down	No	No	Yes	No

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

go down (verb)	get down (verb)
grow smaller	take the first step or steps in carrying out an action
stop operating	put down in writing; of texts, musical compositions, etc.
be defeated	pass through the esophagus as part of eating or drinking
be ingested	lower someone's spirits; make downhearted
go under	move something or somebody to a lower position
disappear beyond the horizon	alight from (a horse)
move downward and lower, but not necessarily all the way	lower (one's body) as by kneeling
be recorded or remembered