没落贵族是指以前很有钱、很有地位，但现在家族已经衰落的贵族。

"没落贵族" refers to nobles who were once wealthy and prestigious but whose families have now declined.

我们也常用这个词来说那些曾经很风光、现在却不行了的人或家庭。

We also often use this term to describe people or families who were once prominent but are no longer doing well.