Antonyms of verb unzip

1 sense of unzip

Sense 1
unzip -- (open the zipper of; "unzip the bag")
       Antonym of zip up (Sense 1)
      => zip up, zipper, zip -- (close with a zipper; "Zip up your jacket--it's cold")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb unzip

1 sense of unzip

Sense 1
unzip -- (open the zipper of; "unzip the bag")
       => unfasten -- (cause to become undone; "unfasten your belt")