/kəmˈpleɪnɪŋ ˈwɪtnəs/ – Phrase
Definition: nhân chứng đã đưa đơn khiếu nại.
A more thorough explanation: A complaining witness is a person who brings a complaint or accusation against another individual in a legal proceeding, typically in a criminal case. This term is often used in the context of criminal law to refer to the individual who alleges that a crime has been committed against them and who is willing to testify or provide evidence in court to support the prosecution of the accused.
Example: The complaining witness testified that she saw the defendant steal the car.