treadmill

/ˈtɹɛd.mɪl/

noun

  1. 1

    A piece of indoor sporting equipment used to allow for the motions of running or walking while staying in one place.

  2. 2

    A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means of prison discipline.

  3. 3

    A mill worked by horses, dogs, etc., treading an endless belt.

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