Where does “żniwak” come from?

żniwak (Polish) comes from Polish żniwo, from Polish żąć, from Proto-Slavic žęti, from Proto-Indo-European gʷʰen-, from Proto-Indo-European bʰon-.

Ancestry of “żniwak”, step by step

StepLanguageWordMeaning
1Polishżniwoharvest
2Polishżąćto reap; to harvest with a sickle or scythe
3Proto-Slavicžętito press, squeeze; to reap, mow
4Proto-Indo-Europeangʷʰen-to strike, slay, kill
5Proto-Indo-Europeanbʰon-—
Every word from Proto-Indo-European bʰon- →Every word from Proto-Indo-European gʷʰen- →Every word from Proto-Slavic žęti →