Where does “podproże” come from?

podproże (Polish) comes from Polish próg, from Proto-Slavic porgъ, from Proto-Balto-Slavic parˀgas, from Proto-Indo-European porg-o-.

Ancestry of “podproże”, step by step

StepLanguageWordMeaning
1Polishprógdoorstep; threshold; fret
2Proto-Slavicporgъthreshold, doorstep
3Proto-Balto-Slavicparˀgas—
4Proto-Indo-Europeanporg-o-—
Every word from Proto-Indo-European porg-o- →Every word from Proto-Balto-Slavic parˀgas →Every word from Proto-Slavic porgъ →