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Synonyms
tread·mill (trĕd́mĭĺ)

noun 

    1. A mechanism rotated by people treading on the moving steps of a wheel.
    2. 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.