go down vs submerse

go down and submerse both are verbs.

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

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

Other hyponyms of go down include settle, subside, founder, submerge.

go down (verb)	submerse (verb)
grow smaller	put under water
stop operating	sink below the surface; go under or as if under water
be defeated
be ingested
go under
disappear beyond the horizon
move downward and lower, but not necessarily all the way
be recorded or remembered