back away vs back out

back away and back out both are verbs.

Word	Noun	Adjective	Verb	Adverb
back away	No	No	Yes	No
back out	No	No	Yes	No

As verbs, back away and back out are synonyms defined as:

back away and back out: make a retreat from an earlier commitment or activity

Other synonyms of back away include crawfish, crawfish out, pull back, pull in one's horns, retreat, withdraw.

back away (verb)	back out (verb)
make a retreat from an earlier commitment or activity	make a retreat from an earlier commitment or activity
	move out of a space backwards