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English definition of “treadmill”

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treadmill

noun [C]  /ˈtredˌmɪl/ us  
a machine for exercising on which you run or walk on a strip that moves back, so that you must move at the same speed as the strip: She works out on a treadmill. A treadmill is also a boring, regularly repeated activity or experience: My life has been a treadmill lately.
(Definition of treadmill from the Cambridge Academic Content Dictionary © Cambridge University Press)
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