The word 'upper' is a straightforward comparative formation from the Old English adverb and preposition 'up,' which has cognates across Germanic languages and traces back to the Proto-Indo-European root upo, meaning "under, up from under, over." The addition of the Old English comparative suffix '-er' creates a word that literally means "more up" or "higher." This comparative sense evolved from a purely directional meaning to encompass hierarchical and positional superiority. Consequently, 'upper' came to describe not only physical placement but also social rank and the top section of an object, such as a shoe.

Structure: up (higher position) + er (comparative suffix) up: Old English origin, meaning "upward, aloft, on high." Functions as the core root denoting a higher position or direction. er: Old English comparative suffix, used to form the comparative degree of adjectives and adverbs. In this case, it forms an adjective meaning "more up" or "higher."