Where does “cos” come from?
cos (Irish) comes from Old Irish cos, from Proto-Celtic koxsā, from Proto-Indo-European koḱs- — joint.
cos (Irish): foot; leg
Ancestry of “cos”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Irish | cos | foot; leg |
| 2 | Proto-Celtic | koxsā | leg, foot |
| 3 | Proto-Indo-European | koḱs- | joint |