Knuckle down

verb

Definitions

Verb
  1. 1
    To get to work; to focus on a task. idiomatic, intransitive

    "You should knuckle down and do your homework!"

  2. 2
    work very hard, like a slave wordnet
  3. 3
    To submit; knuckle under.

Etymology

1864 in American English, from the game of marbles.

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