It means flying in groups in (the yard) every day.

Source:

"Miscellaneous Notes of Dongpo", a work by Su Dongpo (Su Shi), a famous writer and gourmet in the Northern Song Dynasty. The whole story is about loving birds. The profound meaning lies in the word "benevolence". The words at the end of the chapter "A harsh government is more fierce than a tiger, believe it!" shows the essence of the word "benevolence". All human feelings are based on "benevolence". Otherwise, the disaster it will bring to society is incalculable. Therefore, Su Shi advocated governing the world with "benevolence". "The hundreds of officials and the vastness of the four seas make their joints and veins interconnected into one. If you knock, you will hear it, and if you touch it, you will respond. Therefore, the world can be made into one body. The nobleness of the emperor and the lowliness of the people can make them fall in love with each other. We can share sorrows and save others." From the philosophical thought of "benevolence", it has been extended to the idea of ??"benevolent government", which already belongs to the scope of political thought. This is an outstanding allegorical prose. The first paragraph records that the author's mother "eat food and do good deeds, so she "evils and kills" and bans the catching of birds and allows them to grow and multiply, so that the birds are not afraid of being caught by people and get close to people. In fact, it has to protect birds. The second paragraph uses "Youye Laoyan" to express his wish: birds are protected from raptors because they are protected by humans. It is a metaphor that the court and government should protect civilians and prevent bad guys from harming them. It also uses this to insinuate the reality of government corruption and officials harming the people. For example, the phrase "tyranny is fiercer than a tiger" is quoted at the end of the article, which makes the theme of the full text prominent and has a profound meaning. The writing is smooth, natural, and understated, using only a few strokes to outline the beautiful scenery of the courtyard with birds singing and the fragrance of flowers. However, the majesty of being "more fierce than a tiger" in plain nature makes the article extraordinary.

Original text: In the study room where I lived when I was young, there were bamboos and cypresses in front of it, assorted flowers and trees all over the courtyard, and many birds nesting on it. The mother hates killing, and warns her children and servants not to hunt birds and magpies, so for several years they gather their nests on low branches, where their young can look down. There are also four to five hundred tung flowers and phoenixes, and the sun is flying among them. This bird is difficult to see within dozens of miles, but it can live among them without fear of humans. When the villagers heard about it, they thought it was something strange and came to see it. There is no other, human kindness, trust in aliens.

Translation

When I was a child, I lived in a study. There were bamboo and cypress trees in front of the study. The courtyard was filled with flowers, plants and trees, and many birds built their nests there. My mother hated killing, so she warned the children and maidservants around her not to catch birds. Therefore, for several years, the magpies built their nests on low branches, and you could peek at their young when you looked down. There are also four to five hundred tung flower phoenixes that live here every day. This kind of bird is difficult to see within dozens of miles, but they live in the forest and are not afraid of people. When the villagers heard about it, they thought it was strange and came to watch it. For no other reason than human kindness is trusted by birds and beasts.