(racing) A type of motorcycle crash when both tires lose traction and the motorcycle falls onto its side and slides across the tarmac. The rider typically falls off at ground level after the machine has fallen over and begun to slide.

plural of low side

having low sides

plural of low side window

(architecture) A peculiar form of window common in mediaeval churches, and of uncertain use. Windows of this sort are narrow, near the ground, and out of the line of the windows, and in many different situations in the building.