treadmill

noun

1. an exercise device consisting of an endless belt on which a person can walk or jog without changing place

Definition categories: man–made

2. a mill that is powered by men or animals walking on a circular belt or climbing steps

Similar word(s): treadwheel

Definition categories: man–made, grinder, mill

3. a job involving drudgery and confinement

Definition categories: act, business, job, line, occupation