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Jyutping bui3 hei3
Pinyin bèi qì

Definitions (Wiktionary)
  1. verb, colloquial, intransitive, verb-object
    to stop breathing temporarily

背氣 [-气]

Jyutping
Pinyin bèi qì

Definitions (CC-CEDICT)
  1. to stop breathing (as a medical condition)
  2. (fig.) to pass out (in anger)
  3. to have a stroke