The compound noun 'zipper-lock' is a modern English formation that transparently combines two independent nouns. 'Zipper' is a 20th-century American English coinage, derived from the imitative sound 'zip' associated with the fast device's action, with the agent-noun suffix '-er'. 'Lock' has a much deeper history, tracing back to Old English loc, meaning a fastening, bar, or enclosure, from Proto-Germanic luką, related to the act of closing. The compound's logic is entirely literal and functional: it describes a lock specifically designed for, or integrated with, a zipper, merging the concepts of a sliding fastener and a security device into a single named object.

Structure: zipper (fastening device) + lock (fastening device) - zipper: Origin: English (coined from the onomatopoeic 'zip'). Role: The first element, a noun denoting the specific type of fastening device. - lock: Origin: Old English loc. Role: The second element, a noun denoting a fastening or securing mechanism.