To indicate or mark beforehand; to serve as a sign of something that will happen in the future.
Fore- (before) + sign (a mark or indication). Emerged in Middle English as a variant of 'foreshadow,' emphasizing the sign-like nature of the indication rather than shadow imagery.
Foresign is essentially a synonym for foreshadow that hardly anyone uses anymore—it lost out in the historical competition between near-identical words, a phenomenon linguists call 'lexical attrition' where similar words compete and one drives the other extinct.
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