drop back vs get behind

drop back and get behind both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop back	No	No	Yes	No
get behind	No	No	Yes	No

As verbs, drop back and get behind are synonyms defined as:

Other synonyms of drop back include drag, drop behind, hang back, trail.

drop back (verb)	get behind (verb)
take position in the rear, as in a military formation or in the line of scrimmage in football	to lag or linger behind
to lag or linger behind