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Jyutping faat3 san4 ging1
Pinyin fā shén jīng

Definitions (CC-CEDICT)
  1. (coll.) to go crazy
  2. to lose it
  3. demented
  4. unhinged
Definitions (粵典–words.hk)
  1. 動詞
    神經​失常​;​用​嚟​講​啲​人​做​啲​唔​合理​嘅​行​為
    to turn insane; to perform insane actions
    • 佢一起身就係噉鬧人,都唔知佢發咩神經。
      佢一起身就系噉闹人,都唔知佢发咩神经。
      keoi5 jat1 hei2 san1 zau6 hai6 gam2 naau6 jan4, dou1 m4 zi1 keoi5 faat3 me1 san4 ging1.
      He keeps scolding people right from the moment he woke up, there must be something wrong with him.
    • 你俾咁多貼士,發神經咩!
      你俾咁多贴士,发神经咩!
      nei5 bei2 gam3 do1 tip1 si2, faat3 san4 ging1 me1!
      Why are you tipping so much? Are you crazy?
  2. 近義詞
    發瘟、發癲
Definitions (Wiktionary)
  1. verb, verb-object
    to go crazy; to go bonkers
    (syn.) 發瘋, 起魔, 癲起, 起狂, 痟, 發神經病, 發癲, 掠狂, 著狂, 著熱狂, 病狂, 起歁, 發狂, 起痟, 發痴, 起神, 發神經, 起魔神, 起神經, 發癲狂, 起戇
Definitions (Kaifangcidian)
  1. 神經病 – 神经病
  2. 瘋了 – 疯了
  3. 發瘋 – 发疯
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你发神经了吗?
    你發神經了嗎?
    nǐ fā shén jīng le ma ?
    • Have you gone nuts?
    • Have you gone mad?
    • Have you gone crazy?
    • Have you become insane?
    • Have you gone insane?
Examples (粵典–words.hk)
  1. Cantonese
    你俾咁多贴士,发神经咩!
    你俾咁多貼士,發神經咩!
    nei5 bei2 gam3 do1 tip1 si2, faat3 san4 ging1 me1!
    • Why are you tipping so much? Are you crazy?
  2. Cantonese
    发神经
    發神經
    faat3 san4 ging1
    • to go insane