nest egg
US /ˈnest ˌeɡ/
UK /ˈnest ˌeɡ/

1.
養老金, 儲蓄, 備用金
a sum of money saved for the future, especially for retirement or a specific purpose
:
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They're hoping to build up a substantial nest egg for their retirement.
他們希望為退休積累一筆可觀的養老金。
•
Her small inheritance became a valuable nest egg for her children's education.
她的小筆遺產成了孩子們教育的寶貴儲蓄。