treadmill

• a job involving drudgery and confinement
• a mill that is powered by men or animals walking on a circular belt or climbing steps
• an exercise device consisting of an endless belt on which a person can walk or jog without changing place
• 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. Also, a mill worked by horses, dogs, etc., treading an endless belt

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