bob

1. V-I If something bobs, it moves up and down, like something does when it is floating on water. 上下浮动

Huge balloons bobbed about in the sky above. 巨大的气球在上空上下浮动。

2. V-I If you bob somewhere, you move there quickly so that you disappear from view or come into view. 快速移动

She handed over a form, then bobbed down again behind a typewriter. 她递过来一张表格，又快速坐回到打字机后面。

3. N a short abrupt movement, as of the head 点头

4. N a hairstyle for women and children in which the hair is cut short evenly all round the head 波波短发

5. V to cut (the hair) in a bob 剪成波波造型

6. N [英国英语] →(formerly) an informal word for a shilling

7. V to tap or cause to tap or knock lightly (against) 轻敲; 使轻敲

8. N a light knock; tap 轻敲