Definition of knuckle down phrasal verb from the Oxford Advanced American Dictionary

 

knuckle down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

knuckle down (to something)

(informal)
 
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to begin to work hard at something synonym get down to I'm going to have to knuckle down to some serious study.
See the Oxford Advanced Learner's Dictionary entry: knuckle down