back out

动词

To reverse (a vehicle) from a confined space. (transitive) · He backed out of the garage.
To withdraw from something one has agreed to do. (intransitive) · She backed out of organizing the fund-raising.
To convince (someone) to withdraw from a challenge. (transitive)
To bet on someone losing. · See also: sell short
To undo (a change). (transitive) · I had to back out the changes made to the computer when it became apparent that they had stopped it working properly.
To exit a mode or function. (intransitive) · I chose that menu option by accident, so I pressed Escape to back out.
To draw from behind the back (a knife etc.) (as also bare back). (transitive)

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He tried to back out, but dropped his reins and swore dutifully.

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