live off the fat of the land

-živjeti na tuđi račun ili od sredstava koja ne dolaze od rada
-to have enough money to live in a very comfortable way without having to do much work
-to live on stored-up resources or abundant resources

If I had a million dollars, I’d invest it and live off the fat of the land.
Times have changed for the upper classes, many of whom are no longer able to live off the fat of the land.