Ⅰ.
cost (sb) a fortune/a bomb/the earth INFORMAL
► to be very expensive: »
The court case will cost the company a fortune.
Main Entry: ↑cost
Ⅱ.
cost a bomb
► to cost a lot of money: »
Bank loans, if available at all, cost a bomb.
Main Entry: ↑bomb
Financial and business terms. 2012.