Because once a woman got married, she was called to the door in ancient times, so she couldn't go out in her husband's family. The front door is closed, so is the second door. Especially when there are guests at home. Women are not allowed to come out to meet guests. If relatives and friends come, women can come out. However, if a stranger comes to their home, women must stay indoors and don't come out. If someone eats at home, women are not allowed to eat together. This is a traditional family thought.
As for putting an empty bowl at home, it means that all the men in the family have gone out, and only the women in the family are not convenient for others to enter the house. So, after the man in the house went out, the woman put an empty bowl at the door and told the people outside that the man was not at home. Many people will naturally go back when they see an empty bowl at this time. These are also bound by some ancient traditional concepts. After all, it has been said before that lonely men and widows will be gossiped if they don't pay or accept.
Secondly, this kind of empty bowl also has this custom in Jiaozhou, Shandong Province. The main meaning is not the problem from home, but the poor conditions at home and the need for relief from others in the village. If some beggars beg in the countryside and have empty bowls at home, they will not come to beg for food and money. Besides, after marriage, the woman is at home, the man is not at home, and an empty bowl is placed at the door. This proves that the men in this family must pay their wages when they come back. This is also very interesting, but for many rural areas, there are also many pressures, and these pressures also have certain significance.