Treadmill - Definition
treadmill
n 1: an exercise device consisting of an endless belt on which a
person can walk or jog without changing place
2: a mill that is powered by men or animals walking on a
circular belt or climbing steps [syn: treadmill,
treadwheel, tread-wheel]
3: a job involving drudgery and confinement [syn: treadmill,
salt mine]