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English definition of “knuckle down”

knuckle down

informal phrasal verb with knuckle     /ˈnʌk.l̩/ verb
to start working or studying hard: You're going to have to really knuckle down (to your work) if you want to pass your exams.Work, working and the workplaceWorking hours and periods of work
(Definition of knuckle down from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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