Meaning of “treadmill” in the English Dictionary

"treadmill" in British English

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(Definition of “treadmill” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"treadmill" in American English

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treadmillnoun [ C ]

us /ˈtredˌmɪl/

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)