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Jyutping waan4 bou3
Pinyin huán bào

Definitions (Wiktionary)
  1. verb, archaic
    to report back to
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

還報 [还报]

Jyutping
Pinyin huán bào

Definitions (CC-CEDICT)
  1. to return a favor
  2. to reciprocate
  3. (literary) to report back