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idle pulley

or idler pulley

noun, Machinery.
a loose pulley made to press or rest on a belt in order to tighten or guide it.
Also called idle wheel.
Origin of idle pulley
First recorded in 1885-1890 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for idle pulley

idle pulley

a freely rotating trolley used to control the tension or direction of a belt Also called idler
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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