zipper UK /ˈzɪpə(ɹ)/US /ˈzɪpɚ/noun 8verb 5forms 3 noun8 •(US, Australia) A zip fastener.He got his T-shirt stuck in the zipper of his jacket. •A pressure-sensitive plastic closure, as on a Ziploc bag. •(slang) A scar on a person's body.I also competed in track and field at Idaho, and it's all because of putting the shot that I've got my long scar, my zipper, down the back of my neck. — 1969 •A leucine zipper. •A zipline. •A technique for arbitrarily traversing an aggregate data structure and updating its contents. See zipper (data structure). •(slang) A string of clothes pegs or clips attached to the body and then quickly pulled off. •(slang, old-fashioned) An air patrol carried out at dawn or dusk. verb5 •To close a zipper.He zippered his sweater against the cold. •To put a zipper on an article.These fall jackets are zippered. •To act in a manner similar to a zipper. •To act in a manner similar to a zipper closing; to interleave.If more drivers knew how to zipper, the accident would not have disrupted traffic so much. •To unzipper. formszippered · zippering · zippers