Meaning of the word knuckle-down in English

What does knuckle-down mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

knuckle-down

US /ˈnʌk.əl/
UK /ˈnʌk.əl/
1.

to start working or studying hard:

Example:
You're going to have to really knuckle down (to your work) if you want to pass your final exams.
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