v.1. To remove or erase something from a surface by or as if by rubbing: The mechanic grabbed a rag and rubbed off the grease. Don't scrub too hard, or you'll rub the paint off the car.
2. To be removed or be capable of being removed from a surface by rubbing: The ink on the table won't rub off. The newsprint rubbed off on my fingers.
3. To pass from one person to another through direct association, as of a quality: We hope some of her enthusiasm rubs off. I'm glad to see their good manners have rubbed off on you.