[ nǎ hú bù kāi tí nǎ hú ]

人们之间不应该提及别人的隐私。

哪壶不开提哪壶，释义比喻人与人之间不应该提及别人的隐私缺点问题，该说的说，不应该说的不说。

to talk about sb's weak point; lit. mention the pot that doesn't boil (idiom); to touch a sore spot