be wise after the event
US /biː waɪz ˈæftər ðə ɪˈvent/
UK /biː waɪz ˈæftər ðə ɪˈvent/

1.
사후에 현명해지다, 뒤늦게 깨닫다
to understand what should have been done only after something has happened
:
•
It's easy to be wise after the event, but we made the best decision we could at the time.
사후에 현명해지는 것은 쉽지만, 우리는 당시 최선의 결정을 내렸습니다.
•
He always tends to be wise after the event, pointing out mistakes when it's too late.
그는 항상 사후에 현명해지는 경향이 있어, 너무 늦었을 때 실수를 지적한다.