verb (used with object)
to lay bare; disclose; reveal.
to remove the cover or covering from.
to remove a hat from (the head).
verb (used without object)
to remove a cover or covering.
to take off one's hat or other head covering as a gesture of respect.

1250–1300; Middle English uncoveren. See un-2, cover

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World English Dictionary
uncover (ʌnˈkʌvə)
1.  (tr) to remove the cover, cap, top, etc, from
2.  (tr) to reveal or disclose: to uncover a plot
3.  to take off (one's head covering), esp as a mark of respect

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

c.1300, from un- (2) + cover (v.). Earliest use is fig.; lit. sense is attested from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
You'll need to uncover the cooker for the last three hours, so plan ahead.
Second, you must grow an ability to devise solutions for the system problems
  that data and experience uncover.
The basic treasure of his life was buried back there and he kept hoping to
  uncover it.
It's an extremely valuable way to uncover information.
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