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.

1885–1890 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
idle pulley or idler pulley
Also called: idler a freely rotating trolley used to control the tension or direction of a belt
idler pulley or idler pulley

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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