[hwahyt-wosh, -wawsh, wahyt-]
a composition, as of lime and water or of whiting, size, and water, used for whitening walls, woodwork, etc.
anything, as deceptive words or actions, used to cover up or gloss over faults, errors, or wrongdoings, or absolve a wrongdoer from blame.
Sports Informal. a defeat in which the loser fails to score.
verb (used with object)
to whiten with whitewash.
to cover up or gloss over the faults or errors of; absolve from blame.
Sports Informal. to defeat by keeping the opponent from scoring: The home team whitewashed the visitors eight to nothing.

1585–95; white + wash

whitewasher, noun
unwhitewashed, adjective

5. excuse, vindicate, exonerate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whitewash (ˈwaɪtˌwɒʃ)
1.  a substance used for whitening walls and other surfaces, consisting of a suspension of lime or whiting in water, often with other substances, such as size, added
2.  informal deceptive or specious words or actions intended to conceal defects, gloss over failings, etc
3.  informal a defeat in a sporting contest in which the loser is beaten in every match, game, etc in a series: they face the prospect of a whitewash in the five-test series
4.  to cover or whiten with whitewash
5.  informal to conceal, gloss over, or suppress
6.  informal to defeat (an opponent or opposing team) by winning every match in a series

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1591, "to wash a building surface with white liquid," from white + wash. Fig. sense of "to cover up, conceal" is attested from 1762. The noun is recorded from 1697.
Online Etymology Dictionary, © 2010 Douglas Harper
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