The story
- Englishportmanteau
- Proto-Indo-European*bʰréh₂tēr
- Proto-Germanic*brōþēr
- Proto-West Germanic*brōþer
- Old Englishbrōþor
- Middle Englishbrother
- Englishbrotherclip.
- Englishbro
- English todayportmanbro
Blend of portmanteau + bro.
Etymology from Wiktionary, CC BY-SA 4.0.