treadmill

Meanings

Noun

• 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 was used principally as a means of prison discipline.
• A mill worked by horses, dogs, etc., treading an endless belt.

Verb

• To exercise on a treadmill.

Origin

• tread + mill