プログレッシブ和英中辞典(第4版)の解説
あとこうしゃく【後講釈】
a judg(e)ment made in hindsight; criticism made after the fact；〔特に敗因の〕a postmortem
今更何を言っても後講釈でしかない
At this point, anything you say is no more than hindsight.
後講釈はよしてくれ
Please spare me the 「after-the-fact commentary [postmortems]!
後講釈は簡単さ
It's easy to second-guess someone's decisions.