The word 'zip' first emerged in the mid-19th century as an onomatopoeic term for a sharp, whizzing sound. By the late 19th century, it was applied to a type of fast-moving bullet. Its application to the fastening device, a trademark registered in 1925 by the B.F. Goodrich Company, directly borrowed the sense of speed and a sharp sound to describe the action and noise of the closure. The form 'zipped' simply applies the regular Germanic past tense suffix '-ed' to this modern, sound-imitating root, creating the standard inflected form meaning 'fastened with a zip'.

Structure: zip (fastener) + ped (past tense suffix) 'zip' is an onomatopoeic word of imitative origin, representing the sound of a fast-moving object or the sound of a fastener. '-ped' (here realized as -ed) is a suffix of Old English origin, used to form the past tense and past participle of regular verbs.