[oh-ver-hwelm, -welm]
verb (used with object)
to overcome completely in mind or feeling: overwhelmed by remorse.
to overpower or overcome, especially with superior forces; destroy; crush: Roman troops were overwhelmed by barbarians.
to cover or bury beneath a mass of something, as floodwaters, debris, or an avalanche; submerge: Lava from erupting Vesuvius overwhelmed the city of Pompeii.
to load, heap, treat, or address with an overpowering or excessive amount of anything: a child overwhelmed with presents; to overwhelm someone with questions.
to overthrow.

1300–50; Middle English; see over-, whelm

unoverwhelmed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overwhelm (ˌəʊvəˈwɛlm)
1.  to overpower the thoughts, emotions, or senses of
2.  to overcome with irresistible force
3.  to overcome, as with a profusion or concentration of something
4.  to cover over or bury completely
5.  to weigh or rest upon overpoweringly
6.  archaic to overturn

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

early 14c., "to turn upside down, to overthrow," from over + M.E. whelmen "to turn upside down" (see whelm). Meaning "to submerge completely" is mid-15c. Perhaps the connecting notion is a boat, etc., washed over, and overset, by a big wave. Figurative sense of "to bring to
ruin" is attested from 1520s. Related: Overwhelming; overwhelmingly.

mid-15c., pp. adj. from overwhelm.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Everyone is overwhelmed, including Callie, who can't talk or cry or even figure
  out what she's feeling.
We are overwhelmed not only by the volume of submissions but by their quality.
The relief effort is underprepared, underfunded and overwhelmed.
The teachers are overwhelmed -- not only with the teaching they have to do but
  with the clerical work they have to do.
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