Other forms: turned down; turning down; turns down
To turn down is to reduce something, like the way you turn down your music after your mom asks half a dozen times, or to refuse something, like the way you turn down an invitation to a party you don't want to attend.
The phrase Turn down can be used in a variety of ways. You can turn down your own enthusiasm or the air conditioning blasting in your car — anything you want to decrease. And when someone makes an offer you have to refuse, you can also turn that down: "I'm sorry to turn down this opportunity to dress as an elf in the Christmas parade, but my pointy shoes are at the cleaners."