# knuckle down

> English word · Verb

## Definitions
1. To get to work; to focus on a task.
2. To submit; knuckle under.

## Etymology
1864 in American English, from the game of marbles.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/knuckle-down