or idler pulley
a loose pulley made to press or rest on a belt in order to tighten or guide it.
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Also called idle wheel.
Origin of idle pulley
First recorded in 1885–1890
Words nearby idle pulley
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for idle pulley
a freely rotating trolley used to control the tension or direction of a beltAlso 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