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This is not an idiom. "Rapped" means struck sharply, and your "knuckles" are the joints of the fingers. Someone is getting a sharp snap of something (usually a ruler) to the back of their hands, which hurts! In the old days, teachers used this punishment when a child would misbehave in class.

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11y ago
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Q: What does the idiom rapped on the knuckles mean?
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