*knuckle down*

*knuckle down*

Definition: to begin to work or study very hard, usually after a period of not working or studying.

E.g.1. You’ve had a nice holiday, but now it’s time to knuckle down.
E.g.2. If you don’t knuckle down to some hard work soon, you’ll be out of a job!

This phrasal verb can’t be separated.

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