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Definition of treadmill:

  1. 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.


nightmare, pattern, rote, drill, tread-wheel, tragedy, groove, beam, grind, hell, barbell, quagmire, worst-case scenario, trouble, bench, battle, salt mine, balance beam, obstacle course, cross-trainer, stress, multigym, usual, mat, crisis, exercise bike, ordeal, lockstep, treadwheel, dumbbell.

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