Definitions for knuckle down
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Princeton's WordNet
slave, break one's back, buckle down, knuckle down(verb)
work very hard, like a slave
Wiktionary
knuckle down(Verb)
To get to work; to focus on a task.
Origin: 1864 in American English, from the game of marbles.
Citation
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"knuckle down." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/knuckle down>.

