/ ˌəʊvəˈʃædəʊ; NAmE ˌoʊvərˈʃædoʊ/ verb [ vn ] [ often passive ]
1.
to make sb/sth seem less important, or successful :
He had always been overshadowed by his elder sister.
2.
to make an event less enjoyable than it should be
SYN cloud :
News of the accident overshadowed the day's events.
3.
to throw a shadow over sth :
The garden is overshadowed by tall trees.
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WORD ORIGIN
Old English ofersceadwian (see over- , shadow ).