当事人 dāngshìrén persons involved or implicated
persons involved or implicated; party (to an affair)
How to remember 当事人: 当 act as + 事 matter + 人 person = persons involved or implicated.
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How it is used
- The party directly involved in a matter, especially legally - 双方当事人 (shuāngfāng dāngshìrén) both parties; 当事人同意 (dāngshìrén tóngyì) the party concerned agrees.
- Formal/legal register: the person whose interests are at stake in a case or dispute.
- Contrast 旁观者 (pángguānzhě, bystander) or 第三方 (dì-sān fāng, third party).