κόλπος

Kólpos is Greek, meaning a fold, a hollow, the bosom of a garment. The word described the curved space between the body and a loose robe — a pocket of air, a gentle concavity. When Greek geographers needed a word for a large bay — a place where the sea curves inward and the land wraps around it — they reached for kólpos. The Gulf of Corinth, the Gulf of Thessaloniki, the Persian Gulf (Persikos Kolpos) — all were named with the word for a fold in cloth.

Latin borrowed the word as colpus, and it evolved through Italian golfo and French golfe into English gulf by the fourteenth century. The word retained its sense of a large, deep indentation in the coast — bigger than a bay, more open than an inlet. A gulf was a space where the sea reached far inland and the land curved around it protectively, the way a garment curves around a body.

The Gulf of Mexico, named by Spanish explorers in the sixteenth century as Golfo de México, is the ninth-largest body of water in the world. The Persian Gulf has been the center of global energy politics since the discovery of oil in the early twentieth century. The Gulf Stream — the warm ocean current that moderates European climate — takes its name from the Gulf of Mexico, where it originates. The Greek word for a fold in cloth now names the forces that shape global politics, economics, and weather.

The figurative gulf — an unbridgeable gap between two things — appeared in English by the sixteenth century. 'A gulf between rich and poor.' 'A gulf of misunderstanding.' The metaphor extends the geographic sense: a gulf is a chasm, a space so large that the two sides cannot reach each other. The Greek word for a garment's hollow became the English word for distances that cannot be crossed.