KNOB

[noun] [C] - a round handle, or a small round device for controlling a machine or electrical equipmentShe tried to open the door, but the knob came off in her hands.Turn/Twiddle the little knob (= device) to adjust the volume.A knob is also a round lump on the surface or end of something.a brass knob on top of the bed-postA knob can also be a small amount of something solid, esp. butter.Put a knob of butter in the frying pan.(taboo slang) Knob also means penis.(dated) "You stupid fool!" "And the same to you with knobs on!"(UK) With (brass) knobs on means to a great degree.Jon is an environmentalist with knobs on.