verb (used with object), unscrambled, unscrambling.
to bring out of a scrambled condition; reduce to order or intelligibility.
Also, descramble. to make (a scrambled radio or telephonic message) comprehensible by systematically tuning the receiver to the frequencies used in transmission. Compare decode ( def 2 ).

1915–20; un-2 + scramble

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World English Dictionary
unscramble (ʌnˈskræmbəl)
1.  to resolve from confusion or disorderliness
2.  to restore (a scrambled message) to an intelligible form

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

"restore to order," 1923, from un- (2) + scramble (v.). The original notion probably is from the old retort about the impossibility of unscrambling eggs.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It will allow you to unscramble the solution to a partially completed puzzle.
In another, you unscramble words by sliding the tiles into the right order on
  the table.
Read the clues then unscramble the letters to reveal the water-saving talent
Unscramble the words and write them on the blank lines.
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