1) To cast shade over 2) To make dark or gloomy 
• (v. t.) To cover with shade; to render dark or gloomy; to overshadow.
O`ver·shade` transitive verb [ Anglo-Saxon ofersceadwian . See Over , and Shade , and confer Overshadow .] To cover with shade; to render dark or gloomy; to overshadow. Shak. 
to cast shade over. · to make dark or gloomy.