Definition of "unzip"

unzip

verb
third-person singular simple present unzips, present participle unzipping, simple past and past participle unzipped
1. (transitive) To open something using a zipper.
  Quotations
  He turned back and started unzipping a bag.
  2015, Chigozie Obioma, The Fishermen, ONE, page 274
2. (intransitive) To come open by means of a zipper.
3. (computing, transitive) To restore (compressed data) to its original form, from a zip file.