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Jyutping nei4 tin1 daai6 zeoi6
Pinyin mí tiān dà zuì

Definitions (CC-CANTO)
  1. very very serious crime/ sin
Definitions (粵典–words.hk)
  1. 名詞
    極之兇惡​、​十惡​不​赦​嘅​罪行
    heinous crime
    • 你犯下彌天大罪都唔知錯呀?
      你犯下弥天大罪都唔知错呀?
      nei5 faan6 haa6 nei4 tin1 daai6 zeoi6 dou1 m4 zi1 co3 aa4?
      You've committed such a heinous crime and you still don't know you are wrong?
  2. 近義詞
    滔天大罪
Definitions (Wiktionary)
  1. phrase, idiomatic
    extremely great sin
Examples (粵典–words.hk)
  1. Cantonese
    你犯下弥天大罪都唔知错呀?
    你犯下彌天大罪都唔知錯呀?
    nei5 faan6 haa6 nei4 tin1 daai6 zeoi6 dou1 m4 zi1 co3 aa4?
    • You've committed such a heinous crime and you still don't know you are wrong?