Roll definition
The motion of a vehicle in which the springs on one side of the vehicle compress while the springs on the other side extend. If the roll is extensive, the vehicle will fall on its side. Also less accurately called "sway" or "lean," it occurs in corners because the car's center of gravity is almost always higher than the axis about which it rotates. Also see anti-roll bar , rollbar , roll cage , roll center , roll steer , roll stiffness .