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knuckle down

verb

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Time Traveler for knuckle down

Time Traveler

The first known use of knuckle down was circa 1864

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“Knuckle down.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/knuckle%20down. Accessed 16 Apr. 2021.

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