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WordNet-Online 
 Definitions from WordNet
Verb knuckle down has 1 sense 
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| Definitions from the WebTerm: Knuckle DownDescription:Knuckle down is a versatile idiomatic expression that can be used as a phrasal verb, noun, or adjective. It typically refers to the act of focusing, applying oneself diligently, or making a serious effort to achieve a specific goal. Sample Sentences:
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