unmask

[uhn-mask, -mahsk]
verb (used with object)
1.
to strip a mask or disguise from.
2.
to reveal the true character of; disclose; expose.
3.
Military. to reveal the presence of (guns) by firing.
verb (used without object)
4.
to put off one's mask; appear in true nature.

Origin:
1580–90; un-2 + mask

unmasker, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unmask (ʌnˈmɑːsk)
 
vb
1.  to remove (the mask or disguise) from (someone or oneself)
2.  to appear or cause to appear in true character
3.  (tr) military to make evident the presence of (weapons), either by firing or by the removal of camouflage, etc
 
un'masker
 
n

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

unmask
1580s in figurative sense, c.1600 in literal sense, from un- (2) + mask (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
What the mobile ecosystems of today have done is to unmask the reality that it's the back end that matters.
But federal authorities say his dedication was to another cause, spying for the mobsters he was supposed to unmask.
The drug may even unmask dementia that had not been previously noticed.
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