The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱóm
- Proto-Italic*kom
- Proto-Italic*kom-
- Latincon-
- Proto-Indo-European*ḱers-
- Proto-Indo-European*ḱr̥séti
- Proto-Italic*korsō
- Latincurrō
- Latinconcurro
- English todayconcur
Borrowed from Latin concurro (“to run together, agree”).
Etymology from Wiktionary, CC BY-SA 4.0.