tread·mill (trdml)
n.
1.
a. A mechanism rotated by people treading on the moving steps of a wheel.
b. A similar device operated by an animal treading a continuous sloping belt.
2. An exercise device consisting of a continuous moving belt on which a person can walk or jog while remaining in one place.
3. A monotonous task or set of tasks seeming to have no end.
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