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Noun: idle pulley  'I-d(u)l 'pû-lee
  1. A pulley on a shaft that presses against a guide belt to guide or tighten it
    "The mechanic adjusted the idle pulley to reduce belt slippage";
    - idler pulley, idle wheel

Derived forms: idle pulleys

Type of: block, pulley, pulley block, pulley-block