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idler pulley

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idle pulley

–noun Machinery.
a loose pulley made to press or rest on a belt in order to tighten or guide it.
Also, idler pulley.
Also called idle wheel.


Origin:
1885–1890
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To idler pulley
idle pulley also idler pulley  
n.  A pulley on a shaft that rests on or presses against a drive belt to guide it or take up slack. Also called idle wheel.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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