verb (used with object)
to expose or excoriate (a claim, assertion, sentiment, etc.) as being pretentious, false, or exaggerated: to debunk advertising slogans.

1920–25, Americanism; de- + bunk2

debunker, noun

disparage, ridicule, lampoon. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
debunk (diːˈbʌŋk)
informal (tr) to expose the pretensions or falseness of, esp by ridicule
[C20: from de- + bunk²]

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

1923, from de- + bunk; first used by U.S. novelist William Woodward (1874-1950), the notion being "to take the bunk out of things."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The first is excellent on the cosmology and physics interface and the second is
  great at debunking pseudoscience lunacy de jour.
So much has been written debunking this kind of argument that there's no need
  to rehearse it here.
Science is not served by debunking astrologers and snake oil peddlers but by
  debunking the scientists themselves.
Debunking the arguments on nonmotivational grounds is coupled with debunking
  the proponents on motivational grounds.
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