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]
(..) Indeed she does. Marie was a woman with a prodigious appetite... for all things covered with frosting. But her expensive tastes made her the target of much criticism. Why? Because, Sherman... during Marie's reign, the common people (..)2014 Mr. Peabody & Sherman