treadmill Meaning, Definition & Usage
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noun an exercise device consisting of an endless belt on which a person can walk or jog without changing place
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noun a mill that is powered by men or animals walking on a circular belt or climbing steps
tread-wheel; treadwheel.
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noun a job involving drudgery and confinement
salt mine.
WordNet
Tread"mill` noun
Definitions
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. or for physical exercise