incest
Pronunciation:
/ˈɪnsɛst/noun
Definitions
Sexual relations between close relatives, especially immediate family members and first cousins, usually considered taboo; in many jurisdictions, close relatives are not allowed to marry, and incest is a crime.
Example: Genetic problems caused by incest are thought to have plagued many royal families in the Middle Ages.
verb
Definitions
To engage in incestuous sexual intercourse.