Where does “krumpir” come from?

krumpir (Bavarian) comes from Bavarian grumper, from Alemannic German Grumbeer, from German grund-, from German Grund, from Middle High German grunt, from Old High German grunt, from Proto-West Germanic grundu, from Proto-Germanic grunduz — to rub; to stroke; to grind.

Ancestry of “krumpir”, step by step

krumpir traces back through two separate lines of ancestry.

via Bavarian grumper

StepLanguageWordMeaning
1Bavariangrumper
2Alemannic GermanGrumbeerpotato
3Germangrund-basic, fundamental, elementary
4GermanGrundground, land; bottom; reason; motive
5Middle High Germangrunt
6Old High Germangruntground
7Proto-West Germanicgrundu
8Proto-Germanicgrunduzground, foundation
9Proto-Indo-Europeangʰrem-to be angry; to sound, bellow, growl, roar, be...
10Proto-Indo-Europeangʰer-to rub; to stroke; to grind

via German Grundbirne

StepLanguageWordMeaning
1GermanGrundbirnepotato
2GermanBirnepear; lightbulb; head, bonce, noggin
3Middle High Germanbire
4Old High Germanbirapear
5Vulgar Latinpira
6Latinpiruma pear
Every word from Proto-Indo-European gʰer-Every word from Proto-Indo-European gʰrem-Every word from Proto-Germanic grunduz