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Jyutping daam2 saang1 mou4
Pinyin dǎn shēng máo

Definitions (CC-CANTO)
  1. describes a brave and daring person; audacious
Definitions (粵典–words.hk)
  1. 語句
    好大膽​,​做​其他人​唔​敢​做​嘅​嘢​;​通常​帶​貶義​,​話​人魯莽​、​不顧後果
    audacious, reckless, disregard of consequences
    • 你真係膽生毛喇,竟然去偷嘢。
      你真系胆生毛喇,竟然去偷嘢。
      nei5 zan1 hai6 daam2 saan1 mou4 laa3, ging2 jin4 heoi3 tau1 je5
      How audacious! You actually committed theft!
Definitions (Wiktionary)
  1. phrase, Cantonese, Leizhou-Min, idiomatic
    to be audacious but reckless
Definitions (Kaifangcidian)
  1. 膽大包天 – 胆大包天
  2. 膽大妄為 – 胆大妄为
  3. 大膽 – 大胆
  4. 很有膽量 – 很有胆量
Examples (粵典–words.hk)
  1. Cantonese
    你真系胆生毛喇,竟然去偷嘢。
    你真係膽生毛喇,竟然去偷嘢。
    nei5 zan1 hai6 daam2 saan1 mou4 laa3, ging2 jin4 heoi3 tau1 je5
    • How audacious! You actually committed theft!