Where does “gacopierz” come from?

gacopierz (Polish) comes from Polish nietoperz, from Old Polish nietopyrz, from Proto-Slavic netopyřь, from Proto-Indo-European nekʷto-peryo.

Ancestry of “gacopierz”, step by step

gacopierz traces back through two separate lines of ancestry.

via Polish nietoperz

StepLanguageWordMeaning
1Polishnietoperzbat
2Old Polishnietopyrzbat
3Proto-Slavicnetopyřьbat
4Proto-Indo-Europeannekʷto-peryo—

via Polish Gacek

StepLanguageWordMeaning
1PolishGaceklong-eared bat
2Old Polishgacepants, trousers
3Proto-Slavic*gaťęunderwear
Every word from Proto-Indo-European nekʷto-peryo →Every word from Proto-Slavic netopyřь →Every word from Old Polish nietopyrz →