We often look for skeletons in the closets of politicians.

我们经常在衣橱里寻找骷髅。

This expression " a skeleton in the closet" refers to a family secret that is embarrassing or perhaps one that is shameful, that you don't want other people to find out about.

“a skeleton in the closet” 这个表达个令人尴尬家庭秘密， 或个你不想让别人知道可耻秘密。