1.come again 再说一遍
Come again? I didn't quite understand what you said.
再说一遍好吗？你刚说的话我不明白。
2.come clean 全盘托出，招供
The criminal decided to come clean.
罪犯决定供出事实。
3.spring for 请客
Let me spring for dinner.
我来请客吃饭吧。
4.spill the beans 泄漏秘密
Don't spill the beans. It's supposed to be a secret.
别说漏了嘴，这可是个秘密哦！
5.stick in the mud 保守的人
Cathy is such a stick in the mud. She never wants to try anything new.
Cathy真保守，她从不想尝试新事物。

来源 http://www.translator.com.cn/content/garden/garden.asp?kind=AI