Deep blue slogan

A wise head makes a close mouth.

Hidden blue, a popular word on the Internet, is a homonym of "hidden". Metaphor means that people are knowledgeable but introverted, and they don't like to show off their talents in front of others. Hidden, used to express a popular way of speaking among young people. Generally refers to some hidden their unique talents and skills.

Concealing is a kind of wisdom. If you exaggerate yourself, you will suffer more wind and rain, and the exposed rafters will naturally rot first. If a person shows off too much in society at an inappropriate time, no matter how good he is, he will inevitably be hit and attacked by an open gun in the back.

Example:

He always hides his secrets and devotes himself to his career.