Idioms that don't want others to see jokes.

These names are competing with each other

Pinyin mù mù xiāng qù

It shows that people look at each other because of fear or helplessness and don't talk. With "looked at each other".

Yuan Guan Hanqing's "Five Afterwords" is the fourth fold: "When I saw my grandmother and my fourth uncle looking at each other, there must be one person who was dark."