Where does “откашлять” come from?
откашлять (Russian) comes from Russian ка́шлять, from Proto-Slavic kašьľati, from Proto-Slavic kaš(ь)ľь, from Proto-Balto-Slavic kāˀsulia, from Proto-Balto-Slavic kāˀs-, from Proto-Indo-European kʷeh₂s- — to cough.
Ancestry of “откашлять”, step by step
Words derived from “откашлять”