後あとの祭まつり

expression, noun

too late; a day after the fair

Idiomatic expression meaning that an action or regret comes after the opportunity has passed; often used when something is already done and cannot be changed.

• 今いまさら後こう悔かいしても後あとの祭まつりだ。

  It's too late to regret it now.

• 試し験けんが終おわってから勉べん強きょうしても後あとの祭まつりだよ。

  Studying after the exam is over is a day after the fair.