knuckle down

verb
knuckled down; knuckling down; knuckles down

Definition of knuckle down

intransitive verb

: to apply oneself earnestly

First Known Use of knuckle down

circa 1864, in the meaning defined above

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The first known use of knuckle down was circa 1864

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Cite this Entry

“Knuckle down.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knuckle%20down. Accessed 19 Sep. 2020.

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