not know what hit you

US /nɑt noʊ wʌt hɪt ju/
UK /nɑt noʊ wʌt hɪt ju/
"not know what hit you" picture
1.

무슨 일이 일어났는지 모르다, 완전히 놀라다

to be completely surprised or overwhelmed by something, often something negative or sudden

:
When the market crashed, many investors didn't know what hit them.
시장이 폭락했을 때, 많은 투자자들은 무슨 일이 일어났는지 몰랐다.
The boxer landed a punch so fast, his opponent didn't know what hit him.
복서는 너무 빠른 펀치를 날려 상대방은 무슨 일이 일어났는지 몰랐다.