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Jyutping faat3 hoi1 hau2 mung6
Pinyin fā kāi kǒu mèng

Definitions (CC-CANTO)
  1. (verb) to sleep-talk; to talk nonsense
Definitions (粵典–words.hk)
  1. 動詞
    發​夢​嗰​陣​冇​意​識​噉​出​聲​或​講​嘢
    to sleep-talk
    • 你琴晚又發開口夢,真係嚇死我。
      你琴晚又发开口梦,真系吓死我。
      nei5 kam4 maan5 jau6 faat3 hoi1 hau2 mung6, zan1 hai6 haak3 sei2 ngo5.
      You were sleep talking again last night. It really freaks me out.
Definitions (Wiktionary)
  1. verb, Cantonese
    to sleeptalk
    (syn.) 講夢, 講狂話, ngigau, 睏講, 打夢講, 說睡話, 狂眠, 講離話, 夢囈, 財開口夢, 陷眠, 睡說, 發開口夢, 呾夢話, 講懵, 講懵話, 講夜話, 鬼眠, 話睏話, 發夢話, 講眠夢話, 囈語, 講夢話, 發夢天, 說睏話, 開口夢, 做響夢, 話夢話, 發囈似, 打夢話, 說睡語, 打開聲夢講, 說胡話, 說夢話, 說睏話兒, 發囈怔
Definitions (Kaifangcidian)
  1. 說夢話 – 说梦话
Examples (粵典–words.hk)
  1. Cantonese
    你琴晚又发开口梦,真系吓死我。
    你琴晚又發開口夢,真係嚇死我。
    nei5 kam4 maan5 jau6 faat3 hoi1 hau2 mung6, zan1 hai6 haak3 sei2 ngo5.
    • You were sleep talking again last night. It really freaks me out.
  2. Cantonese
    佢瞓紧𠮶阵会发开口梦同郁手郁脚。
    佢瞓緊嗰陣會發開口夢同郁手郁腳。
    keoi5 fan3 gan2 go2 zan6 wui5 faat3 hoi1 hau2 mung6 tung4 juk1 sau2 juk1 goek3.
    • He talks and moves frequently in his sleep.