Where does “кос” come from?

кос (Rusyn) comes from Proto-Slavic kosъ, from Proto-Slavic kopsъ.

кос (Rusyn): Eurasian blackbird

Definitions

  1. Eurasian blackbird

Ancestry of “кос”, step by step

StepLanguageWordMeaning
1Proto-Slavickosъblackbird; skew, slanted
2Proto-Slavickopsъ—
Every word from Proto-Slavic kopsъ →Every word from Proto-Slavic kosъ →