What does “it will cost you” mean?

used to say that sth will be expensive

How is “it will cost you” used?

In GoodFellas (1990), one line is: “I'll think about it. But it'll cost you, Hill. A lot.”

The clip at the top of this page is from GoodFellas (1990).

I'll think about it. But it'll cost you, Hill. A lot.

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