Meaning: Reduce volume, temperature, etc.
Example: The room was too hot, so she TURNED the heating DOWN.
Meaning: Reject an offer, invitation, etc.
Example: They offered her the job, but she TURNED it DOWN.
Meaning: Fold the top covers of a bed down to make it ready for someone to go to sleep
Example: The hotel staff TURNED DOWN the bed and scattered flower petals on it while we was having dinner.