What is an uncle?

Let me answer this simple question. Aunt is your mother's big sister. Uncle is your aunt's husband. Another extended meaning: it is considered unclean for a woman to have her period (that is, menstruation). Superstition is an unknown word, and because she comes to visit menstruation once in January, she uses menstruation to play charades when talking about menstruation. Therefore, when adults say their period, children should not ask if your mother's eldest sister has come and what gift she brought you.