small fortune
US /smɔl ˈfɔr.tʃuːn/
UK /smɔl ˈfɔr.tʃuːn/

1.
一大笔钱, 巨款
a large amount of money, often used ironically to mean a surprisingly large or excessive amount
:
•
That antique vase cost a small fortune.
那个古董花瓶花了一大笔钱。
•
You'll pay a small fortune for a house in this neighborhood.
在这个社区买房子你会花一大笔钱。