The story
- Proto-Indo-European*upó
- Proto-Italic*supo
- Latinsub
- Latinsub-
- Proto-Indo-European*ser-
- Proto-Indo-European*serwos
- Proto-Indo-European*serweyéti
- Proto-Italic*serwijeti
- Proto-Italic*serwijit
- Proto-Italic*serwiō
- Latinservio
- Latinsubserviō
- Latinsubserviens
- English todaysubservient
From Latin subserviens, present active of subservio (“to serve under”).
Etymology from Wiktionary, CC BY-SA 4.0.