Turn down
Turn down
To "turn down" someone or something is to reject an offer or request. For example, she turned down the job offer because she did not want to relocate. It's a polite but firm way to say no.
They offered him the job, but he turned it down.
They made him a job offer, but he declined it.
She turned down the volume on the radio.
She reduced the radio's volume.
He turned down their proposal after much thought.
He rejected their proposal after considering it deeply.