[jak-shaft, -shahft]
noun Machinery.
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 ).
a shaft on which an idle wheel or fairlead turns.

1895–1900; jack1 + shaft

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World English Dictionary
jackshaft (ˈdʒækˌʃɑːft)
a short length of shafting that transmits power from an engine or motor to a machine

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The second group of go-karts have a cross-over jackshaft drive system.
The large boilers are equipped with feedwater economizers and are well tuned, in spite of old jackshaft controls.
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