C1 a round handle, or a small, round device for controlling a machine or electrical equipment球形把手;(机器等的)旋钮
a round lump on the surface or end of something球形突出物
More examples
Turn the knob in a clockwise direction.
He pulled the knob and it just came off in his hand.
She turned the door knob and quietly opened the door.
Twiddle a knob on a radio in Britain and you may hear more voices speaking crackly French or German than English.
At the twiddle of a knob the operators can focus on a tiny amount of airspace or scan the whole area.
a small amount of something solid, especially butter(尤指黄油)小块
UK offensive a penis阴茎
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