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marathon

noun [C] (LONG ACTIVITY)
 
 
/ˈmær.ə.θən/ US  /-θɑːn/

Definition

an activity that takes a long time and makes you very tired: The election broadcast, a nine-hour marathon, lasts until seven o'clock in the morning.Difficult things and peoplePreventing and impeding
(Definition of marathon noun (LONG ACTIVITY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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