Cách sử dụng
The expression "a dead duck" is used to describe something that is no longer useful or successful. It can refer to a failed project, a failed business idea, or a person who is no longer in favor. The term originated from hunting, where a duck that has been shot and killed is no longer a viable target. Therefore, if someone or something is referred to as a dead duck, it means that they are no longer valuable or desirable. It is important to note that this expression is informal and should be used in casual conversations rather than formal situations.