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Jyutping wo6 toi1
Pinyin huò tāi

Definitions (CC-CANTO)
  1. source of the disaster; the root of the trouble
Definitions (Wiktionary)
  1. noun
    root of the trouble; cause of the ruin
    (syn.) 祸根, 祸本, 禍根, 禍本
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)