粵典 (words.hk)香港詞
後悔當初唔採取另一種行動 (to regret not having done something different)
語句用例
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 the competition, but he didn't participate, and now he regrets it.