1. Of an automobile, having the gear enabled that will allow it to be driven backward. Put it in reverse and then back up very slowly.

2. Backwards; in or facing the opposite direction; in the opposite order or position. Can be used as either an adjective or an adverb. Stop putting my books in reverse when you're cleaning! They're supposed to go A to Z, not Z to A! I think his password is just his birthday in reverse. Did you know that your shirt is in reverse? Your tag is sticking out at the back.