knuckle down Definition in the Cambridge English Dictionary
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Definition of “knuckle down” - English Dictionary

Definition of "knuckle down" - American English Dictionary

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knuckle down

 /ˌnʌk·əl ˈdɑʊn/ infml
phrasal verb with knuckle verb
to ​startworking hard: You’re going to have to knuckle down and ​catch up on ​yourschoolwork.
(Definition of knuckle down from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "knuckle down" - British English Dictionary

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knuckle down

informal
phrasal verb with knuckle uk   us   /ˈnʌk.l̩/ verb
to ​startworking or ​studying hard: You're going to have to really ​knuckle down (toyourwork) if you ​want to ​passyourfinalexams.
(Definition of knuckle down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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