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- Dictionarytreadmill/ˈtrɛdmɪl/
noun
- 1. a large wheel turned by the weight of people or animals treading on steps fitted into its inner surface, formerly used to drive machinery.
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noun
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A treadmill is a device generally used for walking, running, or climbing while staying in the same place. Treadmills were introduced before the development of powered machines to harness the power of animals or humans to do work, often a type of mill operated by a person or animal treading the steps of a treadwheel to grind grain. In later times, treadmills were used as punishment devices for peop... Wikipedia