co respondent
/ˌkoʊ rɪˈspɑndənt/
noun
- A person accused of having committed adultery with the spouse of someone who is filing for divorce.
- In the divorce case, the wife named her neighbor as the co-respondent.
- The lawyer questioned the co-respondent about the alleged affair.
- Being named as a co-respondent can be embarrassing and damaging to one's reputation.
Synonyms