Reversing

[Sarah]

Serving to effect reversal, as of motion; capable of beingreversed. Reversing engine, a steam engine having a reversing gear bymeans of which it can be made to run in either direction at will.-- Reversing gear (Mach.), gear for reversing the direction ofrotation at will.

[Sarah]

The act of going through a drivethrough with your car in reverse.

[Julene]

present participle of reverse