(automotive) Of a pneumatic tyre/tire: designed to resist the effects of deflation when punctured, and to allow the vehicle to continue to be driven (although usually at a reduced speed).

(gambling, slang) A crooked die that is shaved down on certain sides to produce the desired rolls more frequently.

To cause a flat spot on (a vehicle tyre), usually by locking the wheels under heaving braking.

A small patch of a vehicle tyre that has been flattened by abrasion with the road surface, so that the tyre is no longer smoothly circular at that point; usually caused by the wheel locking under heavy braking.

The belief in, or advocacy for, the theory that the planet Earth is flat.

Of footwear, having very low heels so that the foot is almost parallel to the ground; low-heeled.

(rail transport, UK) A crossing where two railway lines cross each other on the same level.

plural of flat crossing

(rail transport) A flat spot on a railway wheel caused when a wheel, or both wheels on the same axle, in a moving train stop rotating.

Having a (generally) level upper surface.