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Jyutping hau2 so1
Pinyin kǒu shū

Definitions (CC-CANTO)
  1. (adjective) to describe someone who has a big mouth and cannot keep secrets; loose-lipped; loose-tongued
Definitions (粵典–words.hk)
  1. 形容詞
    一個​人守​唔​到​秘密​,​好容易​就​泄露​咗​出去
    to have a loose tongue, literally "mouth sparse"
    • 佢好口疏㗎,唔好同佢講秘密啊。
      佢好口疏㗎,唔好同佢讲秘密啊。
      keoi5 hou2 hau2 so1 gaa3, m4 hou2 tung4 keoi5 gong2 bei3 mat6 aa3.
      He has a loose tongue, don't ever share secrets with him.
Definitions (Wiktionary)
  1. adj, Cantonese, of a person
    with a loose lip; loose-lipped
Definitions (Kaifangcidian)
  1. 嘴快
  2. 好傳話 – 好传话
  3. 嘴巴不嚴 – 嘴巴不严
  4. 不守秘密
  5. 心裡留不住話 – 心里留不住话
Examples (粵典–words.hk)
  1. Cantonese
    佢好口疏㗎,唔好同佢讲秘密啊。
    佢好口疏㗎,唔好同佢講秘密啊。
    keoi5 hou2 hau2 so1 gaa3, m4 hou2 tung4 keoi5 gong2 bei3 mat6 aa3.
    • He has a loose tongue, don't ever share secrets with him.