To gossip about others or make unwarranted comments.
形容不负责任地胡乱议论。
清·崔灏《通俗编·言笑》莫学他人不知朝暮，走启蒙乡村，说三道四。”
Don't shuosandao about others behind their backs.
Learn the next connected idiom: 说三道四 (shuō sān dào sì) → 四面八方 (sì miàn bā fāng)
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