Daily Chinese Idiom Guessing Game
Known to every household; widely known.
喻明白;晓知道。家家户户都知道。形容人所共知。
《汉书·刘辅传》天下不可户晓。”宋·楼钥《缴郑熙等免罪》而遽有免罪之旨,不可以家谕(喻)户晓。”
This story is so famous that it's known to every household.