The story
- Proto-Indo-European*h₁er-
- Proto-Germanic*erþō
- Proto-West Germanic*erþu
- Old Englisheorþe
- Middle Englisherthe
- Englishearth
- Proto-Indo-European*bʰuH-
- Proto-Germanic*būaną
- Old Norsebúinn
- Middle Englishbownde
- Englishbound
- English todayearthbound
Etymology from Wiktionary, CC BY-SA 4.0.