The story
- Proto-Indo-European*h₁éǵʰ
- Proto-Indo-European*h₁éǵʰs
- Proto-Italic*eks
- Latinex
- Latinex-
- Proto-Italic*kaussā
- Old Latincaussa
- Latincausa
- Latinexcūsāre
- Old Frenchescuser
- Middle Englishexcusen
- Latinexcūsāre
- Old Frenchexcuse
- Middle Englishexcuse
- Englishexcuse
- English todayexcuser
Etymology from Wiktionary, CC BY-SA 4.0.