Meaning of the word "rap somebody on the knuckles" in English

What does "rap somebody on the knuckles" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

rap somebody on the knuckles

US /ræp ˈsʌmˌbɑː.di ɑ:n ðə ˈnʌk.əlz/
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