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Jyutping fong3 haa6 tou4 dou1
Pinyin fàng xià tú dāo

Definitions (Wiktionary)
  1. phrase, idiomatic
    to repent and mend one's ways; to turn over a new leaf
    (syn.) 棄暗投明, 悔过自新, 改惡從善, 洗心革面, 改邪归正, 改邪歸正, 弃旧图新, 弃暗投明, 改恶从善, 改过自新, 改正错误, 棄舊圖新, 重新做人, 悔過自新, 革面洗心, 改正錯誤, 改行自新, 改過自新, 痛改前非