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]
(..) You're smart, you should be studying. I like the study, I need it, but ... #It's hard. I work all day ... Go to night school! Education Community tertiary. It is not expensive. Good job with the house. Looks great. - Thank you. - Very well. We fix here and there. We got it cheap at auction. (..)2014 Boyhood
(..) These companies are bought and sold all the time. #We will have to accept it. I thought you were a musician. I am, but ... Life is expensive, you know. You have to be responsible. #What do you think? Hey, you! What a lack of respect! And the redhead in the bowling alley? #Yeah, what's up? (..)2014 Boyhood