It's an idiom, which means to seize someone else's house or occupy someone else's position. This idiom is usually used to describe those behaviors that get something for nothing and encroach on the fruits of others' labor.
In nature, pigeons are relatively strong birds. They usually occupy other birds' nests and even forcibly expel other birds in order to provide better living conditions for themselves and their young birds. Similarly, some people will occupy other people's houses or positions through improper means, which is the embodiment of getting something for nothing.
In real life, it is not uncommon for pigeons to occupy magpie nests. For example, some people may buy other people's houses or property by illegal means, or take advantage of their positions to occupy other people's positions. These behaviors are immoral and violate laws and moral norms.
In a word, this idiom is usually used to describe those behaviors that get something for nothing and occupy the fruits of others' labor. It reminds us to achieve success and happiness through our own efforts, rather than obtaining other people's property or achievements through improper means. At the same time, we should also respect other people's labor achievements and intellectual property rights in order to maintain social justice and harmony.
Idiom implication
For a person who is determined to make a difference, the key is not to attract the attention of others, and not to let others regard themselves as dangerous opponents, so; In order to constantly create conditions in an environment that is not conducive to oneself. Without foresight, it is easy to be seen through, so it must be hidden in your heart.
Vision can achieve great success. If you want to succeed, first, you can bear it, and don't resent it with small grievances; Second, it is ruthless, not because of small favors; The third is to look far, and don't take care of the overall situation because it is too small. I don't want to give in to others even if I have a strong desire for power. However, when the supreme power is not obtained, it will also face obstacles from enemies, allies and even relatives. For the long-term goal, we should learn to compromise and forbear, and then fight back at an appropriate time.