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  1. Oxford Dictionary

    idle wheel

    • n.
      an intermediate wheel between two geared wheels, especially when its purpose is to allow them to rotate in the same direction.

    • noun: idle wheel, plural noun: idle wheels

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    idle wheel

    • IPA[ˈīdl ˌ(h)wēl]
    • n.
      an intermediate wheel between two geared wheels, especially when its purpose is to allow them ...

    Oxford American Dictionary