He used to be a millionnaire. But now he has become a bum.

（例）他曾经是个百万富翁，不过现在已经变成个穷光蛋了。

The vicissitudes of life may suddenly make a rich man very poor.

在人世的沧桑中, 一个有钱人突然也变成穷光蛋。

By stopping all payments to her sons, she made all three of them poor at one blow.

三个儿子她一个子儿也不给了，他们一下子全成了穷光蛋。