The word "un-zip" typically refers to the action of opening a file or folder that has been compressed or zipped. Its antonyms, therefore, would be words that refer to the opposite action of closing, compressing or zipping. Some possible antonyms for "un-zip" could be "zip," "compress," "bundle up," "pack," "seal," "lock," "encrypt," or "hide." Each of these words implies an action that is opposite to the process of unzipping, which involves expanding or extracting files from a compressed archive. Antonyms are important for building vocabulary and expressing opposite meanings in language.