/ˈpɑlɪgəməs ˈjunjən/ – Phrase
Definition: chế độ đa hôn, chế độ nhiều vợ nhiều chồng.
A more thorough explanation: A polygamous union refers to a marital arrangement in which an individual is legally married to more than one spouse at the same time.
Example: The court ruled that the polygamous union was not recognized under state law.