un-zip

unzip

[uhn-zip]
verb (used with object), unzipped, unzipping.
1.
to open the zipper of.
verb (used without object), unzipped, unzipping.
2.
to become unzipped.

Origin:
1935–40; un-2 + zip2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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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Etymonline
Word Origin & History

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