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I turned the doorknob.

He groped for the doorknob in the dark.

I saw Tom wiping his fingerprints off the doorknob.

So he traded the paperclip for a pen, and then he traded the pen for a doorknob, and the doorknob for a Coleman stove.

I tried to open the door, and the doorknob came off.

the volume control knob

Turn the knob and open the door.

Twist that knob to the right and the box will open.

You can adjust the color on the TV by turning this knob.

That knob didn't seem to realise there's a silent K in there!

a knob of butter

I bought a beautiful brass knob to put on my door.

I tried to turn the knob, but the door was locked.

This knob controls temperature.

Kevin is a total knob!

Move the knob at the side of the seat forwards, collapse the seat.

The lighting was set up to have the intensity controlled by one knob so you could produce the brightness as you want.