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Jyutping m4 sik1 gaa3 bou6
Pinyin wú shí jià bù

Definitions (粵典–words.hk)
  1. x

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Jyutping m4 sik1 gaa3 bou6
Pinyin n2 shí jià bù

Definitions (CC-CANTO)
  1. don't understand the situation; not familiar with the situation