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Jyutping fo2 ngau4
Pinyin huǒ niú

Definitions (CC-CANTO)
  1. (noun) an AC adaptor; an electric transformer; an electrical ballast
Definitions (粵典–words.hk)
  1. 名詞
    變壓器
    transformer
  2. 名詞
    泛指​電子產​品​嘅​充​電​器​或者​電源
    charger or AC adapter in general
    • 部電腦冇電,又唔記得帶火牛。
      部电脑冇电,又唔记得带火牛。
      bou6 din6 nou5 mou5 din6, jau6 m4 gei3 dak1 daai3 fo2 ngau4.
      My computer is out of battery, and I forgot to bring the charger.
  3. 名詞、俚語
    即​係​消防​員​,​帶有​輕​蔑​嘅​成份
    derogatory term for a firefighter; literally: fire bull
Definitions (Wiktionary)
  1. noun, Cantonese, Hakka, Huizhou, Teochew, informal
    transformer
    (syn.) 方棚, 變壓器, 火牛
Definitions (Kaifangcidian)
  1. 變壓器 – 变压器
Examples (粵典–words.hk)
  1. Cantonese
    火牛唔多够力,部电脑行得唔够顺。
    火牛唔多夠力,部電腦行得唔夠順。
    fo2 ngau4 m4 do1 gau3 lik6.
    • The transformer works poorly that the computer does not run smoothly enough.
  2. Cantonese
    部电脑冇电,又唔记得带火牛。
    部電腦冇電,又唔記得帶火牛。
    bou6 din6 nou5 mou5 din6, jau6 m4 gei3 dak1 daai3 fo2 ngau4.
    • My computer is out of battery, and I forgot to bring the charger.
  3. Cantonese
    火牛 飙烟,快啲熄机!
    火牛 飆煙,快啲熄機!
    fo2 ngau4 biu1 jin1, faai3 di1 sik1 ge1!
    • The transformer is smoking. Turn off your computer now!
  4. Cantonese
    火牛过唔到电,唔知有冇得整呢?
    火牛過唔到電,唔知有冇得整呢?
    fo2 ngau4 gwo3 m4 dou2 din6, m4 zi1 jau5 mou5 dak1 zing2 ne1?
    • The transformer does not work in the transfer of electric current. Can it be fixed?