The story
- Proto-Indo-European*bʰreg-
- Proto-Indo-European*bʰrégeti
- Proto-Germanic*brekaną
- Proto-West Germanic*brekan
- Old Englishbrecan
- Middle Englishbreken
- Englishbreak
- Vulgar Latin*dantiāre
- Anglo-Normandauncer
- Middle Englishdauncen
- Englishdance
- Englishbreakdance
- English todaybreakdancer
From breakdance + -er.
Etymology from Wiktionary, CC BY-SA 4.0.