nest egg
一笔储蓄，通常用于未来的投资或退休生活的准备
口语·指储蓄或退休金
英文释义
money that has been saved or invested for the future
例句
I've been putting aside a little each month for my nest egg.
典故来源
源自养鸡业，农民在鸡窝里放假蛋（nest egg）诱使母鸡多下蛋，后比喻为未来储备的钱。