A forecast or prediction made about something that has already happened; a hindsight-based assessment.
Compound of 'after' and 'cast' (from Old Norse kasta, 'to throw'). A rare, somewhat ironic term that plays on the double meaning of 'cast' as both prediction and something already thrown.
An aftercast is essentially hindsight dressed up as a prediction—it's what people do when they say 'I knew the stock would crash' after it already has. It's why expert predictions are surprisingly unreliable; people overestimate how obvious outcomes were beforehand.
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