The Collaborative International Dictionary of English v.0.48:

Foreshadow \Fore*shad"ow\, v. t.
   To shadow or typi?y beforehand; to prefigure. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

foreshadow
    v 1: indicate by signs; "These signs bode bad news" [syn:
         bode, portend, auspicate, prognosticate, omen,
         presage, betoken, foreshadow, augur, foretell,
         prefigure, forecast, predict]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "foreshadow":
   adumbrate, adumbration, augur, augury, auspicate, auspice, betoken,
   betokening, betokenment, bode, body forth, demonstrate, embody,
   exemplify, figure, forebode, foreshadowing, foreshow, foreshowing,
   foretoken, foretokening, have a hunch, have an intimation, hint,
   illustrate, image, impersonate, incarnate, indicant, indicate,
   indication, mirror, omen, personate, personify, portend, portent,
   predict, prefiguration, prefigure, preindication,
   premonitory shiver, premonitory sign, premonitory symptom, presage,
   presignifying, pretypify, prognostic, prognostication, project,
   promise, prophesy, realize, reflect, shadow, shadow forth, sign,
   signal, signify, soothsay, token, tokening, type