Moving very quickly or fastening with a zipper. Can describe rapid motion or the action of closing a zip fastener.
From 'zip', an onomatopoeia first recorded in the 1850s imitating a sharp, quick sound. The fastener meaning developed in the 1920s when B.F. Goodrich coined 'zipper' for the slide fastener, originally called a 'clasp locker'.
The word 'zip' perfectly captures both sound and speed - it's one of those rare words where the sound literally matches the action. Interestingly, zippers were initially considered too complex for everyday clothing and were mainly used on boots and tobacco pouches.
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