knuckle down


knuckled down; knuckling down; knuckles down

intransitive verb

: to apply oneself earnestly

Word History

First Known Use

circa 1864, in the meaning defined above

Time Traveler
The first known use of knuckle down was circa 1864

Dictionary Entries Near knuckle down

Cite this Entry

“Knuckle down.” Dictionary, Merriam-Webster, Accessed 31 Jan. 2023.

Kids Definition

knuckle down

: to apply oneself in an earnest manner

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