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Jyutping gaan1 sai3
Pinyin jiān xì

Definitions (Wiktionary)
  1. noun
    spy; enemy agent; mole
  2. noun, literary
    treacherous person

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Jyutping gaan1 sai3
Pinyin jiān xi

Definitions (CC-CEDICT)
  1. a spy
  2. a crafty person
Definitions (粵典–words.hk)
  1. 名詞
    即​係​二五仔​;​出賣​自己​效忠​嘅​團​體​嘅​人​(​量​詞​:​個​)
    spy
    • 有奸細入咗我哋嘅組織,畀我知係邊個我一定打佢靶。
      有奸细入咗我哋嘅组织,畀我知系边个我一定打佢靶。
      There is a rat among us. I am executing him when I found him.
Definitions (Wiktionary)
  1. noun
    spy; enemy agent; mole
  2. noun, literary
    treacherous person
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他认为我们当中有一个奸细。
    他認為我們當中有一個奸細。
    tā rèn wéi wǒ men dāng zhōng yǒu yí gè jiān xi 。
    • He believes that there is a spy among us.
Examples (粵典–words.hk)
  1. Cantonese
    有奸细入咗我哋嘅组织,畀我知系边个我一定打佢靶。
    有奸細入咗我哋嘅組織,畀我知係邊個我一定打佢靶。
    • There is a rat among us. I am executing him when I found him.