knock someone's block off
US /nɑk ˈsʌm.wʌnz blɑk ɔf/
UK /nɑk ˈsʌm.wʌnz blɑk ɔf/

1.
머리를 날려버리다, 얼굴을 때리다
to hit someone very hard, especially in the head or face, often as a threat or in anger
:
•
If you don't stop bothering me, I'm going to knock your block off!
계속 귀찮게 하면 머리를 날려버릴 거야!
•
He was so angry, he threatened to knock the guy's block off.
그는 너무 화가 나서 그 남자의 머리를 날려버리겠다고 위협했다.