哪壺不開提哪壺

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

Character by character

• 哪(nǎ)how
• 壺(hú)pot
• 不(bù)no
• 開(kāi)open
• 提(tí)carry
• 哪(nǎ)how
• 壺(hú)pot