/ɪnˈsɛstʃuəs ˈjuːnjən/ – Phrase
Definition: sự kết hôn loạn luân, quan hệ tình dục loạn luân.
A more throughout explanation: An incestuous union refers to a relationship or marriage between individuals who are closely related by blood, such as siblings, parents and children, or other close relatives. In many jurisdictions, incestuous unions are considered illegal and prohibited by law due to the potential genetic risks and societal taboos associated with such relationships.
Example: The court found evidence of an incestuous union between the siblings, which violated state laws prohibiting such relationships.