or idler pulley
- 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
- a freely rotating trolley used to control the tension or direction of a beltAlso called: idler