Where does “bosum” come from?

bosum (Middle English) comes from Old English bōsm, from Proto-Germanic bōsmaz, from Proto-Indo-European bʰewH- — to blow; to be; to swell, bend, curve.

Ancestry of “bosum”, step by step

StepLanguageWordMeaning
1Old Englishbōsmbreast, bosom, chest
2Proto-Germanicbōsmazbosom
3Proto-Indo-EuropeanbʰewH-to blow; to be; to swell, bend, curve
Every word from Proto-Indo-European bʰewH- →Every word from Proto-Germanic bōsmaz →Every word from Old English bōsm →