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Jyutping wan4 zam1
Pinyin yūn zhēn

Definitions (Wiktionary)
  1. noun
    dizziness or fainting during an injection process

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Jyutping wan4 zam1
Pinyin yùn zhēn

Definitions (CC-CEDICT)
  1. to faint during acupuncture or injection
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)