v.1. To move backward so that one is farther away from someone or something: Back off the car ahead of you: you're driving too close to it. The dog growled at me when I approached, so I backed off.
2. To move something backward beyond the edge of something: He accidentally backed the truck off the ledge and broke an axle.
3. To decrease the intensity or amount of something: I think I should back off the desserts for a little while so I can lose some weight.
4. To decide not to continue doing something or supporting an idea: You've made up your mind, so don't back off your idea now! Just before they were about to sign the papers to buy the new house, they got nervous and backed off.
5. To stop intimidating, threatening, or pressuring someone: Even as I left the store, the salesman wouldn't back off me. Whenever anyone bothers me, I just tell them to back off.
6. To cause someone or something to stop intimidating, threatening or pressuring: The angry dogs were barking at the poor kid, so I waved a stick and backed them off.