Where does “bojowisko” come from?

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

Ancestry of “bojowisko”, step by step

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