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idle pulley

or idler pulley

noun

, Machinery.
  1. a loose pulley made to press or rest on a belt in order to tighten or guide it.


idle pulley

noun

  1. a freely rotating trolley used to control the tension or direction of a belt Also calledidler


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Word History and Origins

Origin of idle pulley1

First recorded in 1885–1890

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idlenessidler