back out

See also backout

English

Verb

back out (third-person singular simple present backs out, present participle backing out, simple past and past participle backed out)

To reverse a vehicle from a confined space.
He backed out of the garage.
(idiomatic) To withdraw from something one has agreed to do.
She backed out of organizing the fund-raising.
- 1920, Herman Cyril McNeile, Bulldog Drummond Chapter 1
  The girl threw back her head and laughed merrily. "You poor young man," she cried; "put that way it does sound alarming." Then she grew serious again. "There's plenty of time for you to back out now if you like. Just call the waiter, and ask for my bill. We'll say good-bye, and the incident will finish."
(idiomatic, computing) To undo a change.
I had to back out the changes made to the computer when it became apparent that they had stopped it working properly.