Old English ofersceadwian "to cast a shadow over, obscure;" see over + shadow (v.). It was used to render Latin obumbrare in New Testament, as were Middle High German überschatewen, Middle Dutch overschaduwen, Gothic ufarskadwjan in those languages. Figurative sense is from 1580s. Related: Overshadowed; overshadowing.
the tragedy overshadowed the couple's happiness
The tall tree overshadowed the house
overseer
oversell
oversensitive
overset
oversexed
overshadow
overshoe
overshoot
overshot
oversight
oversimplification