köken: From Middle High German bœse, bōse, from Old High German bōsi, from Proto-West Germanic *bausī, from Proto-Germanic *bausuz (“inflated, puffed up, arrogant, bad”), from Proto-Indo-European *bʰew-, *bew- (“to blow, inflate, swell”), akin to Yiddish בייז (beyz), Dutch boos, and English boast.