turn down
Separable
Reduce the volume or heat of something
Can you turn the music down? I am on the phone.
Refuse an offer or a person
She turned down the job because of the low salary.
Separable
The object can go between the verb and the particle: turn the light off, or turn off the light. When the object is a pronoun it must go in the middle: turn it off, never turn off it.
The particle: down
This verb belongs to the group ‘getting less’.
Practise it
Add it to your daily practice or see every verb with down.
Further reading: turn down on Wiktionary (CC BY-SA).