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（門或抽屜的）球形把手
A knob is a round handle on a door or drawer which you use in order to open or close it.
例句
He turned the knob and pushed against the door.
他扭動把手推了推門。
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（柱子或棍子頂部的）疙瘩，節，球狀物
A knob is a rounded lump or ball on top of a post or stick.
例句
A loose brass knob on the bedstead rattled.
床架上一個松動的球形銅扣發出嘎啦聲。
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（機器或設備的）旋鈕
A knob is a round switch on a piece of machinery or equipment.
例句
...the volume knob.
音量旋鈕
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小塊（黃油）
A knob of butter is a small amount of it.
例句
Top the steaming hot potatoes with a knob of butter.
在冒熱氣的馬鈴薯上放一小塊黃油。