Английский Этимологический словарь - buxom

- 12c., buhsum "humble, obedient," from buh- stem of O.E. bugen "to bow" + -som, for a total meaning "capable of being bent." Meaning progressed from "compliant, obliging," through "lively, jolly," "healthily plump, vigorous," to (in women, and perhaps infl. by lusty) "plump, comely" (1589).