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knuckle
mastery/ˈnʌkəl/nounverb
card 1 of 10 · idiom meaning
What does the idiom 'knuckle down' mean?
What does the idiom 'knuckle down' mean?
card 1 of 10 · idiom meaning
What does the idiom 'knuckle down' mean?
What does the idiom 'knuckle down' mean?