knuckle down

Language: en

Meaning: (intransitive,idiomatic)To get towork; tofocuson atask.You shouldknuckle downand do your homework!1939November 10, “Following The War”, inThe Chart‎[1], volume I, number 1,Joplin, Missouri:Joplin Junior College,page 4, column 1:As students all over the United Statesknuckle downto learning, the rumble of war drums once more proclaims Mars high man in Europe. Discarding morbid curiosity, every student should consider it vitally necessary to get a general picture of the causes, movements, and possible effects of World War II. The average U. S. citizen's knowledge of World War II will probably decide his role in it.; Tosubmit;knuckle under.

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