To throw a shadow, or shade, over; to darken; to obscure.

To cause to be sad or disappointing; to cast a sad shadow on; as, an accidental death overshadowed the joy of the festival.

cast a shadow upon; "The tall tree overshadowed the house"; "The tragedy overshadowed the couple's happiness"

OverShadow is an umbrella project for the development of open sourcce Eclipse IDE plugins.

To cover with a superior influence; to be viewed as more important than.

exceed in importance; outweigh; "This problem overshadows our lives right now"

make appear small by comparison; "This year's debt dwarves that of last year"