Knuckle

usgb/ˈnʌkl/Volume
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Anatomy TermPlay
Used to describe where fingers bend, often mentioned in anatomy or when instructing hand movements. SlideWhen playing piano, relax your knuckles.
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Physical GesturePlay
Associated with knocking on doors or surfaces to draw attention, conveying a physical action. SlideHe knocked with his knuckles to avoid using the doorbell.
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Non-Verbal CuesPlay
Knuckles can express non-verbal cues such as anger or frustration when showed clenched. SlideHer clenched knuckles revealed she was holding back her frustration.