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Knuckle down
verb
Definitions
Verb
- 1 To get to work; to focus on a task. idiomatic, intransitive
"You should knuckle down and do your homework!"
- 2 work very hard, like a slave wordnet
- 3 To submit; knuckle under.
Etymology
1864 in American English, from the game of marbles.
See also for "knuckle down"
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Unscramble this word: knuckledown