up是介词，give up表示放弃；交出，例如：

1. She will not give up her children without a struggle.她不会轻易放弃自己的孩子。

2.There comes a point where you give up.现在你该放弃了。

3.I give up ─ tell me the answer.我放弃了，把答案告诉我吧。

4. Don't give up until you have exhausted all the possibilities.只要还有可能就别放弃。