car·nal knowl·edge
noun/ˌkɑːnl ˈnɒlɪdʒ/
/ˌkɑːrnl ˈnɑːlɪdʒ/
[uncountable] (old-fashioned or law)- sexual intercourse (= the physical activity of sex, usually describing the act of a man putting his penis inside a woman’s vagina)
性交（=性的身体活动，通常描述男人将阴茎放入女人阴道的行为）