The term 'wrong-way' is a modern English compound that logically combines two ancient concepts. 'Wrong' originates from a Scandinavian source, related to Old Norse rangr meaning "crooked, unjust," which influenced its Old English counterpart. 'Way' has a deep Proto-Germanic root (wegaz) and is related to the Latin via, both meaning "road" or "journey." The compound emerged to describe the specific condition of traveling or acting in a direction contrary to what is proper or safe. Its literal sense of "incorrect direction" has been extended metaphorically to describe any action or understanding that deviates fundamentally from the correct course.

This is a compound adjective formed from two independent English words: 'wrong' (from Old English wrang, meaning "crooked, wrong, unjust") and 'way' (from Old English weg, meaning "path, road, course of travel"). It functions as a fixed lexical unit.