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Knuckle Down
Knuckle Down
Knuckle Down : Phrases
Meaning:
To apply oneself diligently.
Example:
After receiving poor marks on his first report card, Jason was told to knuckle down and start studying more at home.
Origin:
In the game of marbles, the knuckle has to be placed down on the ground when playing. It's an important rule of the game that the knuckle must be placed exactly at the spot where one's previous marble ended up. From this sense of strict observance of a rule comes the modern sense of earnest application.
