Where does “strożak” come from?

strożak (Polish) comes from German Strohsack, from German Stroh, from Middle High German strō, from Old High German strō, from Proto-West Germanic strau, from Proto-Germanic strawą, from Proto-Indo-European strew-, from Proto-Indo-European sterh₃- — sterile, infertile.

Ancestry of “strożak”, step by step

StepLanguageWordMeaning
1GermanStrohsacksack of straw also to sleep on
2GermanStrohstraw
3Middle High Germanstrō
4Old High Germanstrōstraw
5Proto-West Germanicstraustraw
6Proto-Germanicstrawąstraw
7Proto-Indo-Europeanstrew-to spread, to strew
8Proto-Indo-Europeansterh₃-to spread, extend, stretch out
9Proto-Indo-Europeanster-sterile, infertile
Every word from Proto-Indo-European ster-