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Jyutping m4 sik1 go3 sei2 zi6 dim2 se2
Pinyin wú shí gè sǐ zì diǎn xiě

Definitions (Wiktionary)
  1. phrase, Cantonese
    doesn't know the meaning of fear
    (syn.) 唔知個死字點寫, 唔知个死字点写
Definitions (Kaifangcidian)
  1. 不顧危險 – 不顾危险
  2. 不知利害
  3. 不知死活
  4. 不知厲害 – 不知厉害
  5. 冒昧行事