If 처 (妻) means "wife" and 형 (兄) means "elder brother," what does 처형 (妻兄) mean?

ANSWER: A wife's elder sister, of course.

If 매 (妹) means "younger sister" and 형 (兄) means "elder brother," what does 매형 (妹兄) mean?

ANSWER: An elder sister's husband, of course.

One of the most confusing things about the Korean language is family relationships.