Meaning of “knuckle down” in the English Dictionary

british dictionary

"knuckle down" in American English

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knuckle down

/ˌnʌk·əl ˈdɑʊn/ infml
phrasal verb with knuckle verb

to start working hard:

You’re going to have to knuckle down and catch up on your schoolwork.

(Definition of “knuckle down” from the Cambridge Academic Content Dictionary © Cambridge University Press)