treadmill
Pronunciation:
/ˈtɹɛd.mɪl/noun
Definitions
A piece of indoor sporting equipment used to allow for the motions of running or walking while staying in one place.
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.
A mill worked by horses, dogs, etc., treading an endless belt.