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 ˈsʌm.bɑː.di ɑːn ðə ˈnʌk.əlz/
UK /ræp ˈsʌm.bɑː.di ɑːn ðə ˈnʌk.əlz/
"rap somebody on the knuckles" picture

Idiom

1.

to criticize someone for something they have done wrong

Example:
The teacher had to rap the student on the knuckles for cheating on the exam.
The manager rapped him on the knuckles for being late to the meeting again.
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