go away vs bob under

go away and bob under both are verbs.

Word	Noun	Adjective	Verb	Adverb
go away	No	No	Yes	No
bob under	No	No	Yes	No

As verbs, bob under is a hyponym of go away; that is, bob under is a word with a more specific, narrower meaning than go away:

Other hyponyms of go away include dematerialise, dematerialize, clear.

go away (verb)	bob under (verb)
get lost, as without warning or explanation	disappear suddenly, as if under the surface of a body of water
go away from a place
move away from a place into another direction
become invisible or unnoticeable