/kəʊ-ˈpleɪntɪf/ – noun
Definition: đồng nguyên đơn.
A more thorough explanation: A co-plaintiff is a party who joins with one or more other individuals in bringing a lawsuit or legal action against another party or parties. Each co-plaintiff has an independent claim or cause of action, but they are collectively pursuing the same legal remedy or relief in the same lawsuit.
Example: In a lawsuit, John Smith and Jane Doe are named as co-plaintiffs, alleging that the defendant breached their contract.