Middle English word bosten comes from Proto-Indo-European *bū-, and later Proto-Germanic *bausuz (Bad. Inflated; swollen. Puffed up; proud; arrogant.)

Detailed word origin of bosten

Dictionary entry	Language	Definition
*bū-	Proto-Indo-European (ine-pro)
*bausuz	Proto-Germanic (gem-pro)	Bad. Inflated; swollen. Puffed up; proud; arrogant.
bost	Middle English (enm)
*bauss	Old Norse (non)
boosten	Middle English (enm)

Words with the same origin as bosten