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English definition of “buckle down”

buckle down

verb uk phrasal verb with buckle   /ˈbʌk.l̩/ us  
to start working hard: He'll have to buckle down (to his work) soon if he wants to pass these exams.Work, working and the workplaceWorking hours and periods of work
(Definition of buckle down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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