Source : Webster's Revised Unabridged Dictionary (1913)

Overshadow \O`ver*shad"ow\, v. t. [imp. & p. p. {Overshadowed};
   p. pr. & vb. n. {Overshadowing}. ] [Cf. {Overshade}. ]
   1. To throw a shadow, or shade, over; to darken; to obscure.

            There was a cloud that overshadowed them. --Mark ix.
                                                  7.

   2. Fig.: To cover with a superior influence. --Milton.