verb (used with object)
to open or spread out (something rolled or coiled): to unroll a bolt of fabric.
to lay open; display; reveal.
Obsolete. to strike from a roll or register.
verb (used without object)
to become unrolled or spread out: The scrolls unroll easily.
to become continuously visible or apparent: The landscape unrolled before our eyes.

1375–1425; late Middle English unrollen. See un-2, roll

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World English Dictionary
unroll (ʌnˈrəʊl)
1.  to open out or unwind (something rolled, folded, or coiled) or (of something rolled, etc) to become opened out or unwound
2.  to make or become visible or apparent, esp gradually; unfold

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

1412, from un- (2) + roll (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Melt butter, add sugar and cinnamon, unroll crescents and place peach quarters
  in each one.
When the plant is done, the leaf will unroll and the insect exoskeleton will be
Unroll the fabric in such a manner as to avoid snagging or dragging the fabric
  over sharp objects during installation.
These results were then used to estimate the torque needed to unroll the wire
  under these low temperature conditions.
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