hem comes from Old English hem ('border, edge of a garment'), from Proto-Germanic *hamją, related to the notion of confining or enclosing. The history explains the modern form through the named earlier word or formation, without requiring a separate speculative ancestry. In present English, the noun sense is "the bordered edge of a garment; to fold and sew such an edge", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as hemstitch, and in derivatives such as hemmer, hemming, and hemline. Its semantic neighborhood includes border, edge, margin, and fringe, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English hem and Proto-Germanic *hamją.