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Jyutping noi6 gaan1
Pinyin nèi jiān

Definitions (CC-CEDICT)
  1. undiscovered traitor
  2. enemy within one's own ranks
Definitions (粵典–words.hk)
  1. 名詞
    潛伏響​自己​組​織​嘅​卧底
    secret enemy agent within one's own ranks; traitor
    • 如果我知道佢係內奸,我一定唔放過佢。
      如果我知道佢系内奸,我一定唔放过佢。
      jyu4 gwo2 ngo5 zi1 dou3 keoi5 hai6 noi6 gaan1, ngo5 jat1 ding6 m4 fong3 gwo3 keoi5.
      If I knew he was the traitor, I would definitely not let him get away with it.
  2. 近義詞
    內鬼
Definitions (Wiktionary)
  1. noun
    secret enemy agent within one's ranks; hidden traitor
Examples (粵典–words.hk)
  1. Cantonese
    内奸
    內奸
    noi6 gaan1
    • a rat
  2. Cantonese
    如果我知道佢系内奸,我一定唔放过佢。
    如果我知道佢係內奸,我一定唔放過佢。
    jyu4 gwo2 ngo5 zi1 dou3 keoi5 hai6 noi6 gaan1, ngo5 jat1 ding6 m4 fong3 gwo3 keoi5.
    • If I knew he was the traitor, I would definitely not let him get away with it.