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idle pulley

or idler pulley

See more synonyms on Thesaurus.com
noun Machinery.
  1. a loose pulley made to press or rest on a belt in order to tighten or guide it.

Origin of idle pulley

First recorded in 1885–1890
Also called idle wheel.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for idle pulley

idle pulley

idler pulley

noun
  1. 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

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