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Jyutping fui3 bat1 dong1 co1
Pinyin huǐ bù dāng chū

Definitions (CC-CEDICT)
  1. to regret one's past deeds (idiom)
Definitions (粵典–words.hk)
  1. 語句
    後​悔​當初​唔​採取​另​一種​行動
    to regret not having done something different
    • 今次佢本來有機會贏比賽,但佢冇參加到,令佢悔不當初。
      今次佢本来有机会赢比赛,但佢冇参加到,令佢悔不当初。
      gam1 ci3 keoi5 bun2 loi4 jau5 gei1 wui6 jeng4 bei2 coi3, daan6 keoi5 mou5 caam1 gaa1 dou3, ling6 keoi5 fui3 bat1 dong1 co1.
      He could have won in this competition, but he did not join. That made him regrettable.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to regret having done something
Examples (粵典–words.hk)
  1. Cantonese
    今次佢本来有机会赢比赛,但佢冇参加到,令佢悔不当初。
    今次佢本來有機會贏比賽,但佢冇參加到,令佢悔不當初。
    gam1 ci3 keoi5 bun2 loi4 jau5 gei1 wui6 jeng4 bei2 coi3, daan6 keoi5 mou5 caam1 gaa1 dou3, ling6 keoi5 fui3 bat1 dong1 co1.
    • He could have won in this competition, but he did not join. That made him regrettable.
  2. Cantonese
    悔不当初
    悔不當初
    • to regret not having done something