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VERB
（像物體在水中飄浮似的）上下移動，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...
一個個巨大的氣球在頭頂的藍天中漂浮著。
The raft bobbed along more quietly.
小木筏更加平靜地漂浮向前。
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VERB
快速移動；突然消失（或出現）
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.
她遞過來一張表格，隨后又立刻埋頭在打字機后面忙活起來。
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VERB
（快速）點（頭）（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階梯上向每位旅客點頭致意。
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N-COUNT
（英國舊時貨幣單位）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）齊短發，蘑菇頭，波波頭
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；小玩意兒
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.
這架顯微鏡內有價值數百美元的電子元件。