unzip

verb (used with object), un·zipped, un·zip·ping.

1. to open the zipper of.

verb (used without object), un·zipped, un·zip·ping.

2. to become unzipped.

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

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