Definition of treadmill noun from the Oxford Advanced American Dictionary

     

    treadmill

     noun
    noun
    NAmE//ˈtrɛdmɪl//
     
     
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  1. 1[countable] an exercise machine that has a moving surface that you can walk or run on while remaining in the same place I try to do half an hour's exercise on the treadmill every morning.
  2. 2 [singular] work or a way of life that is boring or tiring because it involves always doing the same things I'd like to escape the office treadmill.
  3. 3 [countable] (especially in the past) a large wheel turned by the weight of people or animals walking on steps around its inside edge, and used to operate machinery
See the Oxford Advanced Learner's Dictionary entry: treadmill