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Jyutping dou1 zi2 zeoi2 dau6 fu6 sam1
Pinyin dāo zi zuǐ dòu fu xīn

Definitions (Wiktionary)
  1. phrase, idiomatic
    someone who has a sharp tongue but a soft heart; someone with more bark than bite
    • 我們都知道你是個刀子嘴豆腐心。
      我们都知道你是个刀子嘴豆腐心。
      wǒ men dōu zhī dào nǐ shì ge dāo zi zuǐ dòu fu xīn .
      We all know that even though you talk tough, you're a softy underneath it all.
Examples (Wiktionary)
  1. Mandarin
    我们都知道你是个刀子嘴豆腐心。
    我們都知道你是個刀子嘴豆腐心。
    wǒ men dōu zhī dào nǐ shì ge dāo zi zuǐ dòu fu xīn .
    • We all know that even though you talk tough, you're a softy underneath it all.