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; jack1 + shaft

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World English Dictionary
jackshaft (ˈdʒækˌʃɑːft) [Click for IPA pronunciation guide]
 
n
a short length of shafting that transmits power from an engine or motor to a machine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Jackshaft is always a great word to know.
So is zedonk. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
the offspring of a zebra and a donkey.
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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