Skid

skid

1. Chiefly US and Canadian one of the logs forming a skidway

2. a support on which heavy objects may be stored and moved short distances by sliding

3. a shoe or drag used to apply pressure to the metal rim of a wheel to act as a brake

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skid [skid]

(aerospace engineering)

The metal bar or runner used as part of the landing gear of helicopters and planes.

(engineering)

A device attached to a chain and placed under a wheel to prevent its turning when descending a steep hill.

A timber, bar, rail, or log placed under a heavy object when it is being moved over bare ground.

A wood or metal platform support on wheels, legs, or runners used for handling and moving material. Also known as skid platform.

(mechanical engineering)

A brake for a power machine.

(mining engineering)

An arrangement upon which certain coal-cutting machines travel along the working faces.

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Skid 

the locking of the wheels of a vehicle—for example, a motor vehicle, a streetcar, or railroad rolling stock—while the vehicle is in motion. As a result of such locking, the wheels slide over the bearing surface rather than turn.

A skid occurs when the braking force exceeds the force of adhesion between the wheels and the surface of a road or track, for example, in the presence of glaze ice or after rain. Skidding increases the braking distance and may cause traffic accidents. As a rule, the skidding of the rear wheels of a motor vehicle results in sideslip of the rear axle.

To avoid skids, modern motor vehicles may be equipped with automatic devices that prevent the wheels from locking.