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Jyutping kui2 nung4
Pinyin kuì nóng

Definitions (Wiktionary)
  1. verb, of a sore etc.
    to fester; to ulcerate
    (syn.) 發爛, 发烂

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Jyutping kui2 nung4
Pinyin huì nóng

Definitions (CC-CEDICT)
  1. (of a sore etc) to fester; to ulcerate
Definitions (Wiktionary)
  1. verb, of a sore etc.
    to fester; to ulcerate
    (syn.) 發爛, 发烂