Where does “skoruszyna” come from?

skoruszyna (Polish) comes from Polish Skorupa, from Proto-Slavic skorupa, from Proto-Slavic skora, from Proto-Indo-European (s)ḱer- — dung, manure, filth; manure, dung, filth.

Ancestry of “skoruszyna”, step by step

StepLanguageWordMeaning
1PolishSkorupacarapace, shell
2Proto-Slavicskorupacrust?, shell?
3Proto-Slavicskorabast, skin
4Proto-Indo-European(s)ḱer-dung, manure, filth; manure, dung, filth
Every word from Proto-Indo-European (s)ḱer- →Every word from Proto-Slavic skora →Every word from Proto-Slavic skorupa →