nest egg
noun
1
- a sum of money saved for the future积蓄; 储备金：
I worked hard to build up a nice little nest egg.
我努力地工作以攒下一些钱。
2
- a real or artificial egg left in a nest to induce hens to lay eggs there留窝蛋（留放在窝中以引诱母鸡把蛋生在窝中的真蛋或假蛋）。