To disclose the true character of; expose.(verb-transitive)
To remove one's mask.(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unmask" in a sentence
"I always enjoy the ersatz, erstwhile attempts to "unmask" your true identity."
"He has boasted that his real intention was to "unmask" Arafat."
"I'm a Christian but I'm not big on religion but I do produce a television program right now called "The Way of the Master" and that basically is -- it's a Christian reality program where we kind of unmask the -- the hypocrisy of a lot of modern religion that you see today."