Princeton's WordNet

1. back out(verb)

   move out of a space backwards

   "He backed out of the driveway"

2. retreat, pull back, back out, back away, crawfish, crawfish out, pull in one's horns, withdraw(verb)

   make a retreat from an earlier commitment or activity

   "We'll have to crawfish out from meeting with him"; "He backed out of his earlier promise"; "The aggressive investment company pulled in its horns"

Kernerman English Learner's Dictionary

1. back out(verb)æk

   to decide not to do sth you had agreed to do

   to back out at the last minute

Wiktionary

1. back out(Verb)

   To reverse a vehicle from a confined space.

2. back out(Verb)

   To withdraw from something one has promised to do.

3. back out(Verb)

   To undo a change.

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