fall away vs fall off

fall away and fall off both are verbs.

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

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

fall away (verb)	fall off (verb)
fall to a lower standard	fall heavily or suddenly; decline markedly
diminish in size or intensity	diminish in size or intensity
	come off