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VERB
（像物体在水中飘浮似的）上下移动，起伏
If something bobs, it moves up and down, like something does when it is floating on water.
例句
Huge balloons bobbed about in the sky above...
一个个巨大的气球在头顶的蓝天中漂浮着。
The raft bobbed along more quietly.
小木筏更加平静地漂浮向前。
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VERB
快速移动；突然消失（或出现）
If you bob somewhere, you move there quickly so that you disappear from view or come into view.
例句
She handed over a form, then bobbed down again behind a typewriter.
她递过来一张表格，随后又立刻埋头在打字机后面忙活起来。
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VERB
（快速）点（头）（如打招呼等）
When you bob your head, you move it quickly up and down once, for example when you greet someone.
例句
A hostess stood at the top of the steps and bobbed her head at each passenger.
一位空姐站在最高的阶梯上向每位旅客点头致意。
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N-COUNT
（英国旧时货币单位）先令
In Britain, people used to refer to a shilling as a bob.
例句
I've only got ten bob on me.
我身上只有10先令。
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N-COUNT
（女式）齐短发，蘑菇头，波波头
A bob is a fairly short hair style for women in which the hair is the same length all the way round, except for the front.
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PHRASE
零碎物件；小玩意儿
Bits and bobs are small objects or parts of something.
例句
The microscope contains a few hundred dollars-worth of electronic bits and bobs.
这架显微镜内有价值数百美元的电子元件。