The story
- Proto-Indo-European*úp
- Proto-Indo-European*upér
- Proto-Germanic*uber
- Old Englishofer-
- Middle Englishover-
- Englishover-
- Proto-Indo-European*h₂er-
- Proto-Indo-European*h₂érmos
- Proto-Germanic*armaz
- Proto-West Germanic*arm
- Old Englishearm
- Middle Englisharm
- Englisharm
- English todayoverarm
Etymology from Wiktionary, CC BY-SA 4.0.