unzip

from WordNet (r) 3.0 (2006)

unzip
    v 1: open the zipper of; "unzip the bag" [ant: {zip}, {zip up},
         {zipper}]

from The Free On-line Dictionary of Computing (8 July 2008)

unzip

   1. <tool, compression> To extract files from an archive
   created with {PKWare}'s {PKZIP} archiver.

   2. <tool, compression> 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}.

   (1995-03-06)