turn down

verb

• To refuse, decline, or deny.

  "He turned down all our offers of help."

• To reduce the power, etc. of something by means of a control, such as the volume, heat, or light.

  "Turn down the television so I can hear myself think."

• To reposition by turning, flipping, etc. in a downward direction.

  "Turn down the blankets to let them air out."