The story
- Proto-Indo-European*h₁én
- Proto-Indo-European*h₁entér
- Proto-Indo-European*h₂én
- Proto-Indo-European*dʰeh₁-?
- Proto-Indo-European*(H)n̥dʰí
- Proto-Indo-European*(H)n̥dʰér
- Proto-Germanic*under
- Proto-West Germanic*undar
- Old Englishunder-
- Middle Englishunder-
- Englishunder-
- Proto-Indo-European*bʰers-
- Proto-Indo-European*bʰr̥stís
- Proto-Germanic*bʰurstís
- Proto-Germanic*burstiz
- Frankish*bursti
- Vulgar Latin*brustia
- Old Frenchbroisse
- Middle Englishbrusshe
- Englishbrush
- English todayunderbrush
Etymology from Wiktionary, CC BY-SA 4.0.