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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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