心知肚明

The physical heart; the mind or intellect; feelings or emotions; the center or core of something; intention or will.

To know; to understand; to be aware of; to recognize; to distinguish; to associate with; to entertain or treat; knowledge or learning.

Belly or abdomen; the stomach of an animal (especially when used as food).

bright; light; clear; to understand; to make clear; to shine; public; the Ming Dynasty.