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verb (used with object), un·zipped, un·zip·ping.
  1. to open the zipper of.
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verb (used without object), un·zipped, un·zip·ping.
  1. to become unzipped.
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Origin of unzip

First recorded in 1935–40; un-2 + zip2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unzip


verb -zips, -zipping or -zipped
  1. to unfasten the zip of (a garment) or (of a zip or garment with a zip) to become unfastenedher skirt unzipped as she sat down
  2. (tr) computing to decompress (a file) that had previously been zipped
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unzip


1939, from un- (2) + zip (v.). Related: Unzipped; unzipping.

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Online Etymology Dictionary, © 2010 Douglas Harper