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Jyutping heoi1 fo2
Pinyin xū huǒ

Definitions (CC-CEDICT)
  1. excess of internal heat due to poor general condition (TCM)
  2. the prestige of another person, which one borrows for oneself
Definitions (粵典–words.hk)
  1. 名詞
    (​中醫​)​身體​虛弱​、​陰液​不足​而陽氣​變得​相對​旺盛​,​產生​躁熱​表象​,​又​稱​陰虛​火旺
    (Chin med.) relatively excess of heat(Yang) caused by leak of fluid (Yin) in internal organs ; irritableness
    • 你虛火上升,要多啲休息。
      你虚火上升,要多啲休息。
      nei5 heoi1 fo2 soeng6 sing1, jiu3 do1 di1 jau1 sik1.
      You have relatively excess of heat within your body; you need more rest.
  2. 名詞
    比喻​一​啲​趨勢​只​係​一時​熱潮​,​無​乜​實力​,​唔​能夠​持續​,​好​快會​減退
    a simile of the trends that doesn't have true driving force, cannot sustain for long, just a fad that would drop quickly
    • 依家個市只係虛火,社會經濟因素全部向下,啲指數好快又會跟住跌返落嚟。
      依家个市只系虚火,社会经济因素全部向下,啲指数好快又会跟住跌返落嚟。
      The stock market now is just in a fad, you can see the economy elements of the society is all going down, the indexes will follow and drop soon.
  3. 反義詞
    實火
Definitions (Wiktionary)
  1. noun, Chinese, traditional
    excessive internal heat due to poor health
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    你虚火上升,要多啲休息。
    你虛火上升,要多啲休息。
    nei5 heoi1 fo2 soeng6 sing1, jiu3 do1 di1 jau1 sik1.
    • You have relatively excess of heat within your body; you need more rest.
  2. Cantonese
    依家个市只系虚火,社会经济因素全部向下,啲指数好快又会跟住跌返落嚟。
    依家個市只係虛火,社會經濟因素全部向下,啲指數好快又會跟住跌返落嚟。
    • The stock market now is just in a fad, you can see the economy elements of the society is all going down, the indexes will follow and drop soon.