n.[C]

1. 球形突出物；疖；瘤
2. （棒等的）圆头
   Her umbrella is capped with a glass knob.

   她的伞的顶端装有一个玻璃圆头。

3. 球形把手；（收音机等的）旋钮
   He turned the knob and the door burst open.

   他转动球形把手，门猛地开了。

4. 圆丘，小山

n.

1. a rounded lump or ball, especially at the end or on the surface of something.
   ▸a ball-shaped handle on a door or drawer.
   ▸a round button on a machine.
2. a small lump of something:
   a knob of butter.
3. chiefly N. Amer. a prominent round hill.
4. vulgar slang a man's penis.

v.