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jackshaft - 2 dictionary results

jack⋅shaft

[jak-shaft, -shahft]
–noun Machinery.
1. Also called countershaft. a short shaft, connected by belting, gears, etc., that transmits motion from a motor or engine to a machine or machines being driven (distinguished from main shaft ).
2. a shaft on which an idle wheel or fairlead turns.

Origin:
1895–1900; jack 1 + shaft
jack·shaft   (jāk'shāft')   
n.  A short shaft that transmits motion from a motor to a machine, especially in an automobile.
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