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The Collaborative International Dictionary of English v.0.48 (gcide)

hindsight \hindsight\ n.
understanding the nature of an event after it has happened;
as, hindsight is always clearer than foresight.
[WordNet 1.5]

{20-20 hindsight}, {twenty-twenty hindsight} Perfect
understanding of an event after it has happened; -- a term
usually used with sarcasm in response to criticism of
one's decision, implying that the critic is unfairly
judging the wisdom of the decision in light of information
that was not available when the decision was made.
[PJC]