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Jyutping saam1 m4 sik1 cat1
Pinyin sān wú shí qī

Definitions (粵典–words.hk)
  1. 語句、俚語
    完全​唔​識​一個​人​,​無​任何​關​係
    to be strangers; to have no knowledge of whom a person is
    • 我同你三唔識七,我點解要信你喎?
      我同你三唔识七,我点解要信你㖞?
      ngo5 tung4 nei5 saam1 m4 sik1 cat1, ngo5 dim2 gaai2 jiu3 seon3 nei5 wo3?
      I don't know who you are, why should I trust you?
  2. 近義詞
    三九唔識七
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to be complete strangers
Definitions (Kaifangcidian)
  1. 互不認識 – 互不认识
  2. 素不相識 – 素不相识
  3. 完全沒有關係 – 完全没有关系

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Jyutping saam1 m4 sik1 cat1
Pinyin sān n2 shí qī

Definitions (CC-CANTO)
  1. (slang) to not know someone; to be strangers;
Examples (粵典–words.hk)
  1. Cantonese
    我同你三唔识七,我点解要信你㖞?
    我同你三唔識七,我點解要信你喎?
    ngo5 tung4 nei5 saam1 m4 sik1 cat1, ngo5 dim2 gaai2 jiu3 seon3 nei5 wo3?
    • I don't know who you are, why should I trust you?