- unfasten the zip fastener of；decompress (a compressed file).
verb: unzip, 3rd person present: unzips, gerund or present participle: unzipping, past tense: unzipped, past participle: unzipped
- 1. unfasten the zip fastener of he unzipped his black jacket
- 2. decompress (a compressed file).
- unfasten the zipper of (an item of clothing): he unzipped his black jacket
Oxford American Dictionary