The story
- Proto-Indo-European*h₂ent-
- Proto-Indo-European*h₂énts
- Proto-Germanic*anda-
- Proto-West Germanic*anda-
- Old Englishand-
- Old Englishon-
- Middle Englishon-
- Englishun-
- Proto-Indo-European*bʰreg-
- Proto-Indo-European*bʰrégeti
- Proto-Germanic*brekaną
- Proto-West Germanic*brekan
- Old Englishbrecan
- Middle Englishbreken
- Englishbreak
- English todayunbreak
From un- + break, popularised in songs sung by The Alarm ("Unbreak the Promise") and Toni Braxton ("Un-Break My Heart").
Etymology from Wiktionary, CC BY-SA 4.0.