back away vs pull in one's horns

back away and pull in one's horns both are verbs.

Word	Noun	Adjective	Verb	Adverb
back away	No	No	Yes	No
pull in one's horns	No	No	Yes	No

As verbs, back away and pull in one's horns are synonyms defined as:

back away and pull in one's horns: make a retreat from an earlier commitment or activity

Other synonyms of back away include back out, crawfish, crawfish out, pull back, retreat, withdraw.

back away (verb)	pull in one's horns (verb)
make a retreat from an earlier commitment or activity	make a retreat from an earlier commitment or activity