To diminish the speed, volume, intensity, or flow of something by or as if by turning a dial: Turn down the radio, please. He turned down the TV so his roommate could study.
2. To reject or refuse someone or something: I turned down the invitation. We turned them down because their offer was too low.
3. To fold something downward: I turned my collar down. She turned down the flaps on her hat to protect her ears from the cold.
4. To prepare some bed by folding the outer covering down: The hotel maid came in and turned down the bed.