Cost a fortune

"Cost a fortune" is an idiomatic expression that means something is very expensive or costs a lot of money. It's often used to emphasize that the cost of something is higher than expected or more than what is considered reasonable.

Here are some examples of how you might use this phrase in a sentence:

That new sports car must have cost a fortune!

The renovations to their house cost a fortune, but it looks amazing now.

I can't believe how much they spent on that vacation - it must have cost a fortune!

Overall, "cost a fortune" is a way of saying that something is very expensive or costs a lot of money. It's often used to express surprise or shock at the high cost of something.