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

1.
pécule, économies, bas de laine
a sum of money saved for the future, especially for retirement or a specific purpose
:
•
They're hoping to build up a substantial nest egg for their retirement.
Ils espèrent se constituer un important pécule pour leur retraite.
•
Her small inheritance became a valuable nest egg for her children's education.
Son petit héritage est devenu un précieux pécule pour l'éducation de ses enfants.