WordWeb Online

1. Be greater in significance than
   "the tragedy overshadowed the couple's happiness";
   - dominate, eclipse
    
2. Make appear small by comparison
   "This year's debt overshadows that of last year";
   - shadow, dwarf
    
3. Cast a shadow upon
   "The tall tree overshadowed the house"

Derived forms: overshadowing, overshadowed, overshadows

Type of: becloud, befog, brood, bulk large, cloud, command, dominate, fog, haze over, hover, loom, mist, obnubilate, obscure, overlook, overtop