Skidding is a driving maneuver in which the driver intentionally causes the tires of the vehicle to lose traction with the road surface, resulting in the car sliding sideways. This can be done deliberately, as in drifting, or unintentionally, as when a driver loses control of the vehicle due to excessive speed or poor road conditions. Skidding can also leave tire marks on the road surface, which is what the crossword solution LEAVE TIRE MARKS, PERHAPS is referring to.