[Verb] To cast a cloud over something; to be more important than something else. Example: The wedding day was overshadowed by the recent death of the brides father.
Found on http://www.bbc.co.uk/skillswise/glossary/
O`ver·shad'ow transitive verb [ imperfect & past participle Overshadowed; present participle & verbal noun Overshadowing . ] [ Confer Overshade . ] 1. To throw a shadow, or shade, over; to darken; to obscure. « Ther... Found on http://www.encyclo.co.uk/webster/O/56