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Jyutping zi1 tau4 m4 zi1 mei5
Pinyin zhī tóu wú zhī wěi

Definitions (粵典–words.hk)
  1. 形容詞
    只​知道​一件​事​嘅​開​頭​,​而​唔​知道​後​期​發展
    Only know what happened at the beginning, but don't know what happened afterward
    • 你知頭唔知尾,唔好咁快下判斷啦
      你知头唔知尾,唔好咁快下判断啦
      nei5 zi1 tau4 m4 zi1 mei5, m4 hou2 gam3 faai3 haa6 pun3 dyun6 laa1.
      You only know what happened at the beginning, but you don't know what happened afterward, don't judge so soon.
  2. 近義詞
    唔知頭唔知路
Definitions (Kaifangcidian)
  1. 知其一不知其二

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Jyutping zi1 tau4 m4 zi1 mei5
Pinyin zhī tóu n2 zhī wěi

Definitions (CC-CANTO)
  1. (slang) know the beginning of a story/an event/a situation but not the end
Examples (粵典–words.hk)
  1. Cantonese
    你知头唔知尾,唔好咁快下判断啦
    你知頭唔知尾,唔好咁快下判斷啦
    nei5 zi1 tau4 m4 zi1 mei5, m4 hou2 gam3 faai3 haa6 pun3 dyun6 laa1.
    • You only know what happened at the beginning, but you don't know what happened afterward, don't judge so soon.