| 单词 | knuckle down | 
| 释义 | knuckle down phrasal verb   See full dictionary entry for  knuckle If someone  knuckles down, they begin to work or study very hard, especially after a period when they have done very little work.  [informal]  The only thing to do was knuckle down and get on with some serious hard work. [VERB PARTICLE]     He managed to knuckle down to his lessons long enough to pass his examination. [VERB PARTICLE + to]     | 
	
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