the.com/ocean current

means A large, persistent flow of ocean water moving in a consistent direction, driven by wind, temperature and salinity differences, and the Earth's rotation.

from 'Ocean' traces back through Latin 'oceanus' to Greek 'Ōkeanos', the vast river the ancients imagined encircling the whole flat world — itself possibly linked to older words for a great cosmic water. 'Current' comes from Latin 'currere', meaning 'to run,' via Old French 'corant' — the same root that gives us 'course' and 'courier.' So the phrase is almost tautological in its bones: a 'running' built atop a word that once meant 'the river around everything.' Science just gave the ancient image coordinates, temperatures, and a role in the climate system.