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Jyutping hei3 am3 tau4 ming4
Pinyin qì àn tóu míng

Definitions (CC-CEDICT)
  1. to renounce the dark and seek the light
  2. to give up one's wrong way of life and turn to a better one
Definitions (粵典–words.hk)
  1. 動詞
    背棄​邪​惡​嘅​一方​,​投向​正​義​嘅​一方
    betray the evil side and embrace righteous side
Definitions (Wiktionary)
  1. phrase, idiomatic
    to forsake darkness and come to the light; to forsake darkness for light; to turn over a new leaf
    (syn.) 放下屠刀, 悔過自新, 改邪歸正, 改邪归正, 弃旧图新, 改行自新, 重新做人, 革面洗心, 悔过自新, 改恶从善, 痛改前非, 改过自新, 改正错误, 改過自新, 棄舊圖新, 改正錯誤, 改惡從善, 洗心革面
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    弃暗投明
    棄暗投明
    qì àn tóu míng
    • to give up one's wrong way of life and turn to a better one (literally, “to forsake darkness and come to the light”)