not know what hit you
US /nɑt noʊ wʌt hɪt ju/
UK /nɑt noʊ wʌt hɪt ju/

1.
لا يعرف ما أصابه, يتفاجأ تمامًا
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.
عندما انهار السوق، العديد من المستثمرين لم يعرفوا ما أصابهم.
•
The boxer landed a punch so fast, his opponent didn't know what hit him.
وجه الملاكم لكمة سريعة جدًا، لدرجة أن خصمه لم يعرف ما أصابه.