後の祭り
Common
Expression
Noun
1
expressions (phrasesnoun (common) (futsuumeishi)
idiomatic expression
a day after the fair;(at a) stage when it's too late
いまさら嘆いても、それこそ、後の祭だよ。
You can regret it all you want, but it won't do you any good now.
Other forms
後の祭 【あとのまつり】