co-respondent

劍橋詞典

the person who a married person is said to have committed adultery (= sex outside marriage ) with
（與他人配偶通奸的）共同被告
He was cited /named as co-respondent in the divorce . 他作爲該離婚案的共同被告被傳訊。
比較
respondent 返回 co-respondent