Meaning of “to be wise after the event” in the English Dictionary

british dictionary

"to be wise after the event" in British English

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to be wise after the event

mainly UK

used to mean that it is easy to understand what you could have done to prevent something bad from happening after it has happened:

In retrospect, we should have insisted on checking his calculations, but it's easy to be wise after the event.

(Definition of “to be wise after the event” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)