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]
(..) ♪ So lost, for you ♪ ♪ Oh, when you come / Crash into me ♪ ♪ Into me baby / And I come into you ♪ ♪ Touch your lips just so I know / In your eyes ♪ They're really nice socks. They're expensive actually. They wick moisture away from your feet. My feet always have moisture. Mom, I love them. (..)2017 Lady Bird
(..) I believe it. So, I'm applying to a couple of east coast schools. I need you to help me with the financial aid application but Mom can't know. We... aren't they quite expensive? First, yes. That's why financial aid. Second, I have to get in first. Mom won't be happy about it. Just pull over here. (..)2017 Lady Bird