(bobbed, bobbing)no obj., with adverbial of direction
1- make a quick, short movement up and down上下移动; 颠簸：
I could see his ginger head bobbing about
我可以看到他姜黄色的脑袋在上下移动
the boat bobbed up and down.
那艘船不住地颠簸。
1.1
- with obj. cause (something) to make such a movement使上下移动, 使颠簸：
she bobbed her head.
她点了点头。
1.2
- no obj., with adverbial of direction make a sudden move in a particular direction so as to appear or disappear突然出现（或消失）：
a lady bobbed up from beneath the counter.
一位女士突然从柜台底下冒了出来。
1.3
- no obj. move up and down briefly in a curtsy微微鞠躬（或屈膝）行礼。
1
- a quick, short movement up and down抖动, 颠簸：
she could only manage a slight bob of her head.
她最多只能轻轻地点一下头。
1.1
- a brief curtsy屈膝礼, 鞠躬礼。
短语
bob and weave
- make rapid bodily movements up and down and from side to side, for example as an evasive tactic by a boxer身体左挡右闪。
bob for apples
- try to catch floating or hanging apples with one's mouth alone, as a game咬苹果游戏（用嘴巴咬住摆动或悬挂着的苹果的游戏）。
词源
late Middle English: of unknown origin.
1
- a style in which the hair is cut short and evenly all round so that it hangs above the shoulders（发型）蘑菇式, 波波头。
2
- a weight on a pendulum, plumb line, or kite-tail钟摆, 摆锤, 测锤; 风筝坠子。
3
- a bobsleigh大雪橇, 连橇。
4
- a short line at or towards the end of a stanza诗节末尾的短行。
verb
bobbed, bobbing
1
- with obj. [usu. as adj. bobbed] cut (someone's hair) in a bob把（头发）剪成蘑菇式（或波波头）。
2
- no obj. ride on a bobsleigh乘大雪橇。
词源
late Middle English (denoting a bunch or cluster)： of unknown origin.
(复同单)
1- Brit. informal a shilling〈英, 非正式〉（一）先令。
1.1
- used with reference to a moderately large but unspecified amount of money相当多的一笔钱：
those vases are worth a few bob.
那些花瓶值不少钱哪。
词源
late 18th cent.: of unknown origin.