verb (used with object), unzipped, unzipping.
to open the zipper of.
verb (used without object), unzipped, unzipping.
to become unzipped.

1935–40; un-2 + zip2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unzip (ʌnˈzɪp)
vb , -zips, -zipping, -zipped
1.  to unfasten the zip of (a garment) or (of a zip or garment with a zip) to become unfastened: her skirt unzipped as she sat down
2.  (tr) computing to decompress (a file) that had previously been zipped

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

1939, from un- (2) + zip.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

unzip definition

1. To extract files from an archive created with PKWare's PKZIP archiver.
2. A program to list, test, or extract files from a ZIP archive, commonly found on MS-DOS systems. zip, creates ZIP archives; both programs are compatible with archives created by PKWARE's PKZIP and PKUNZIP for MS-DOS.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Unzip your sleeping bag, shake it out and check for bugs.
Unzip the file or files you downloaded into the folder or directory you created for storing the publication.
To check this, unzip one of the cushions and check to see if the color is the same top and bottom.
Do not unzip any file into a folder or directory other than the one you created.
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