Where does “piwsko” come from?

piwsko (Polish) comes from Polish -sko, from Polish -isko, from Old Polish -isko, from Proto-Slavic -isko — Alternative form of *-išče.

Ancestry of “piwsko”, step by step

StepLanguageWordMeaning
1Polish-skoforms augmentatives
2Polish-iskoforms augmentatives; forms nouns
3Old Polish-iskoforms nouns, typically relating to place
4Proto-Slavic-iskoAlternative form of *-išče
Every word from Proto-Slavic -isko →Every word from Polish -isko →Every word from Polish -sko →