The Collaborative International Dictionary of English v.0.48:

Foreshow \Fore*show"\, v. t. [AS. foresce['a]wian to foresee,
   provide; fore + sce['a]wian to see. See Show, v. t.]
   To show or exhibit beforehand; to give foreknowledge of; to
   prognosticate; to foretell.
   [1913 Webster]

         Your looks foreshow
         You have a gentle heart.                 --Shak.
   [1913 Webster]

         Next, like Aurora, Spenser rose,
         Whose purple blush the day foreshows.    --Denham.
   [1913 Webster]

WordNet (r) 3.0 (2006):

foreshow
    v 1: foretell by divine inspiration

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "foreshow":
   adumbrate, auspicate, betoken, bode, forebode, forerun, foreshadow,
   foretoken, harbinger, have a hunch, have an intimation, herald,
   omen, portend, predict, preindicate, presage, promise, shadow,
   shadow forth