1. to refuse.
- I thanked Mr Smith for the job offer, but turned it down.
- Would you turn down money to do something you don't enjoy?
- I offered to give her a lift to work, but she turned down my offer.
- The bank turned Sally down for a loan.
2. to reduce.
- Could you please turn down the volume of the TV? I'm trying to study.
- Everyone was annoyed with Tim because he kept turning the central heating down.