back out vs back away

back out and back away both are verbs.

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

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

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

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

back out (verb)	back away (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