Knuckle
/nˈʌkəl/
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Definition
(noun) Any of the joints between the bones of the fingers.
Sentence Examples
You'd better knuckle down to work.
As incredible as it may seem, she ordered a knuckle of ham with sauerkraut.
CEFR Practice Quiz
He hurt his ____ when he accidentally hit his hand against the hard edge of the wooden table today.