Her decision to leave the company proved to be an 'expensive' mistake. [=a mistake that caused her to lose a lot of money]
They live in an 'expensive' neighborhood. [=a neighborhood in which houses, apartments, etc., cost a lot to buy or rent]
an 'expensive' shop [=a shop that sells expensive things]
(..) why must I burn? ? you're the one who put the hole in the wall. I may have. Look, I mean, room and board is expensive. I think that we should live together next year. So this was my way of easing you into it, you know? Getting you comfortable (..)2010 TvShow: Scrubs Title: Our Thanks Season: 9 Episode 13