jackshaft

jackshaft
/jak"shaft', -shahft'/, n. Mach.
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.
[1895-1900; JACK1 + SHAFT]

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Universalium. 2010.

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