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4WD abbreviation of "four-wheel drive," a car that drives by means of all four wheels rather than the rear wheels only, or the drive system of such, in which both front and rear wheel axles are turned by the drive shaft.
four-wheel drive a car that drives by means of all four wheels rather than the rear wheels only, or the drive system of such, in which both front and rear wheel axles are turned by the drive shaft.
freewheel a device in some cars, helicopters, or the like that lets the drive shaft continue turning when its speed is greater than that of the engine shaft. [1/4 definitions]
transmission a system or assemblage of gears by which power is transmitted from one mechanism to another, as from the engine to the drive shaft of an automobile. [1/4 definitions]