Where does “błocisko” come from?

błocisko (Polish) comes from Polish błoto, from Old Polish błoto, from Proto-Slavic bolto, from Proto-Balto-Slavic balta.

Ancestry of “błocisko”, step by step

StepLanguageWordMeaning
1Polishbłotomud
2Old Polishbłotomud
3Proto-Slavicboltoswamp; mud
4Proto-Balto-Slavicbalta—
Every word from Proto-Balto-Slavic balta →Every word from Proto-Slavic bolto →Every word from Old Polish błoto →