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English definition of “exertion”

exertion

noun [C, U]     /ɪɡˈzɜːʃən/
the use of a lot of physical or mental energy to do something: I get out of breath with any kind of physical exertion.Trying and making an effortEffort and expending energyEffort and expending energyTrying and making an effort
(Definition of exertion noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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