earth

This is one of those sturdy, mud-on-the-boots words that never needed fancy tailoring. In Old English, eorþe meant the ground under your feet, the dirt in the furrow, and even the human realm itself — basically everything below the clouds. By around 1400, English speakers were also using it for the planet as a whole, long before anyone had seen a blue marble floating in space. Its German cousins are still walking around in plain sight: German Erde and Dutch aarde, both with the same blunt, soil-smudged feel. The word has even wandered into electricity, where to earth a wire means to send it back to the planet’s giant metal sink. A word that began as dirt ended up naming the whole world, which is a pretty good trick for a lump of ground.