1[singular]work or a way of life that is boring or tiring because it involves always doing the same thingsI'd like to escape the office treadmill.2[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 machinery3[countable]an exercise machine that has a moving surface that you can walk or run on while remaining in the same placeI try to do half an hour's exercise on the treadmill every morning.
ˈtredmɪl
ˈtredmɪl