1. refers to a person or thing with an ugly image and appearance, which is similar to the meaning of "ugly" and "ugly duckling".
2. It means that a person's words and deeds are stupid and childish, and it can also mean that someone has made a stupid decision or behavior.
In the network context, it can also be used to express inappropriate comments or replies, or to express dissatisfaction with someone.
4. In some cases, ducks can also refer to male sex workers or men who provide sexual services.
When using the word "duck", we should pay attention to the tone and context so as not to cause unnecessary misunderstanding or offense.