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

1.
꾸짖다, 질책하다
to criticize someone for something they have done wrong
:
•
The teacher had to rap the student on the knuckles for cheating on the exam.
선생님은 시험에서 부정행위를 한 학생을 꾸짖어야 했다.
•
The manager rapped him on the knuckles for being late to the meeting again.
매니저는 그가 회의에 또 늦어서 그를 꾸짖었다.