drop off vs fall away

drop off and fall away both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop off	No	No	Yes	No
fall away	No	No	Yes	No

As verbs, drop off and fall away are synonyms defined as:

Other synonyms of drop off include drop away, slip.

drop off (verb)	fall away (verb)
change from a waking to a sleeping state	fall to a lower standard
fall to a lower standard	diminish in size or intensity
fall or diminish
retreat
remove (cargo, people, etc.) from and leave