make a killing
US /meɪk ə ˈkɪlɪŋ/
UK /meɪk ə ˈkɪlɪŋ/

1.
大賺一筆, 發大財
to make a lot of money very quickly and easily
:
•
He made a killing in the stock market during the tech boom.
他在科技繁榮時期在股市上大賺了一筆。
•
They're hoping to make a killing by selling their startup.
他們希望通過出售他們的初創公司來大賺一筆。