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Jyutping jat1 nim6 zi1 caa1
Pinyin yī niàn zhī chā

Definitions (CC-CEDICT)
  1. momentary slip
  2. false step
  3. ill-considered action
Definitions (粵典–words.hk)
  1. 名詞
    一時​之間​錯​誤​嘅​信念​或者​諗​法​,​可以​帶​嚟​嚴重後果
    wrong belief or thought in a moment of weakness which could lead to serious consequences
    • 佢殺人只係因為一念之差。
      佢杀人只系因为一念之差。
      keoi5 saat3 jan4 zi2 hai6 jan1 wai6 jat1 nim6 zi1 caa1.
      He murdered somebody just because of a wrong thought at a critical moment.
Definitions (Wiktionary)
  1. phrase, idiomatic
    the difference caused by a single thought; momentary slip; ill-considered action
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    一念之差
    一念之差
    jat1 nim6 zi1 caa1
    • wrong decision leading to serious consequence
  2. Cantonese
    佢杀人只系因为一念之差。
    佢殺人只係因為一念之差。
    keoi5 saat3 jan4 zi2 hai6 jan1 wai6 jat1 nim6 zi1 caa1.
    • He murdered somebody just because of a wrong thought at a critical moment.