Why did going to the toilet in ancient times mean "relieving oneself"?

When the ancients went to the toilet, they often said "go to the toilet" and "go to the toilet". Later, "relieving oneself" also became the meaning of going to the toilet. The word "hand in hand" originally refers to the pleasant "hand in hand" when friends meet, which is equal to the modern handshake. When you leave, you say "that's it". In Song Dynasty, Qin Guan wrote in "Two Rhymes Fighting Wild Pavilion": "It is more difficult to stop the boat in spring." In other words, when friends meet in spring, they are so happy that they are reluctant to leave and finally stop for their friends. In the Ming Dynasty, the word "Jieshou" mainly meant to untie the rope and jieshou, which really evolved into the meaning of going to the toilet.

At the beginning of the Ming Dynasty, the Central Plains was vast and sparsely populated, and the land was barren because of war. In order to balance the various regions and stabilize the ruling order, the rulers ordered forced immigration. However, people at that time were unwilling to emigrate from their hometown, so many people sneaked away and returned to their hometown during the immigration period. To prevent this from happening again, immigration officials will form a group of immigrants and tie their hands with ropes to ensure the number of immigrants. Those immigrants often have one arm tied and dozens of people tied together. If a person wants to move, it will inevitably lead to the whole body, and others will feel it, and no one can escape.

So on the trip, if someone wants to go to the toilet, they will say to those officials, "Please untie my hand, I want to defecate (urinate)." Later, people talked too much. For the sake of simplicity, they just said "jieshou". As long as someone shouts "stop", it is that he has to pee. It's like this all the way, every day, every month (it's a long way to emigrate), and everyone says they're used to it, so they set it up and spread it gradually.