美国俚语学习（ U 字母开头）
cuclife.com - 03-28
| umpteen | countless | You bought umpteen pairs of shoes this year. |
| uncle | you quit | If you say uncle, this fight is over. |
| up | happy and cheerful | He has been up ever since he met his new girlfriend. |
| upchuck | vomit | He had to upchuck because he drank too much alcohol. |
| uptight | anxious | Try not to be uptight about your new job. |