/ ˌʌnˈzɪp; NAmE / verb ( -pp- )
1.
[ vn , v ] if you unzip a piece of clothing, a bag, etc., or if it unzips , you open it by undoing the zip that fastens it
OPP zip up
2.
[ vn ] ( computing ) to return a file to its original size after it has been compressed (= made smaller)
SYN decompress
OPP zip