A zipper is a sliding fastener. You'll get cold and wet if you don't zip the zipper on your coat during a blizzard.

Zippers are usually made of metal or plastic teeth that fit together as you slide a tab along them. It's common to have a zipper on your coat, jeans, or dress instead of snaps or buttons. Suitcases and sleeping bags are usually closed with zippers too. The zipper was invented in 1917, but it was initially called a "zip." At the time, a zipper was a particular type of boot that zipped closed.

Definitions of zipper
  1. noun
    a fastener for locking together two toothed edges by means of a sliding tab
    synonyms: slide fastener, zip, zip fastener
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    type of:
    fastener, fastening, fixing, holdfast
    restraint that attaches to something or holds something in place
  2. verb
    close with a zipper
    synonyms: zip, zip up
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    open the zipper of
    type of:
    fasten, fix, secure
    cause to be firmly attached
Word Family
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