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]