/ɪnˈvɑləntɛri ˈplɛntɪf/ – Phrase
Definition: nguyên đơn bắt buộc, nguyên đơn bất đắc dĩ.
A more thorough explanation: An involuntary plaintiff is a party who is added to a lawsuit by court order, typically because their interests are so closely related to the subject matter of the case that their presence is necessary for a complete resolution of the issues involved.
Example: In a civil lawsuit involving a car accident, the pedestrian who was injured may become an involuntary plaintiff if the driver of the car refuses to accept liability and the pedestrian is forced to file a lawsuit to seek compensation for their injuries.