1, in the game, salute each other.

2, refers to some things to reach a consensus, or some things to cooperate successfully, punch each other to congratulate.

3. The way young people greet each other. This boxing style originated in America and Europe. Usually, this is a very good way for partners to express friendship and show tacit understanding to outsiders. Later, in order to celebrate the success of something, the two sides made an expression.