verb (used with object)
to be more important or significant by comparison: For years he overshadowed his brother.
to cast a shadow over; cover with shadows, clouds, darkness, etc.; darken or obscure: clouds overshadowing the moon.
to make sad or hang heavily over; cast a pall on: a disappointment that overshadowed their last years.
Archaic. to shelter or protect.

before 900; Middle English overshadewen, Old English ofersceadwian. See over-, shadow

overshadower, noun
overshadowingly, adverb

1. eclipse, outshine, dwarf.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overshadow (ˌəʊvəˈʃædəʊ)
1.  to render insignificant or less important in comparison
2.  to cast a shadow or gloom over

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. ofersceadwian "to cast a shadow over, obscure," from ofer "over" + sceadwian "to shadow" (see shadow); used to render L. obumbrare in N.T. Fig. sense is from 1581.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We as a nation can never again let our fascination with technology overshadow
  the need to win in close combat.
Even if he behaves himself, he could still overshadow his boss through sheer
  talent and energy.
In both countries frustration over the unsteady direction of change has tended,
  perhaps unfairly, to overshadow real gains.
They wanted someone who did not overshadow national leaders, but acted as a
  secretary general for their summits.
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