后悔莫及
      Explanation: Regret: regret afterwards. That is too late to regret afterwards
      Usage: Supplemental; for the predicate; remorse or exhort people to describe
      Source: Fan Ye Southern Song "on the Later Han Ji Guangwu": "do not accept defected, regret less."
      Examples: Has to be careful what had happened to the event ~ the.
  • Thesaurus:  useless to regret, Useless to regret Mo and, s too late (to do)