Friendship is the tacit understanding of spirits, the communication of hearts, and the combination of virtues.

——William Peng

1.

Hidden coincidence.

Shen Congwen's "Cai Yuan": "There is only a tacit understanding between the hearts, which cannot be expressed in words."

2.

A secret treaty or oral agreement.

Mao Zedong's "Questioning the Kuomintang": "Since many of your speeches and actions are exactly the same as all those speeches and actions of the enemy and traitors, there is no difference between them. How can we not make people suspect that you and the enemy and traitors are colluding with each other?" , or has some kind of tacit agreement been reached?"

3.

A secret agreement.

Mao Dun's "Midnight": "The Japanese newspaper also said that someone has a tacit understanding with the North and will defect."