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English definition of “knuckle down”

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knuckle down

informal
verb uk phrasal verb with knuckle   /ˈnʌk.l̩/ us  
to start working or studying hard: You're going to have to really knuckle down (to your work) if you want to pass your final exams.
(Definition of knuckle down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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