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buxom [buxom 词源字典]: buxom: [12] Originally, buxom meant ‘obedient’. It goes back to an unrecorded *būhsum, which meant literally ‘capable of being bent’, and was formed from the verb būgan ‘bend’, from which modern English gets bow. The sequence by which the word’s present-day sense developed seems to have been ‘compliant, obliging’, ‘lively, jolly’, ‘healthily plump and vigorous’, and finally (of a woman) ‘large-breasted’.
=> bow[buxom etymology, buxom origin, 英语词源]
glee: glee: [OE] Glee has had a strange history. It was common in Old English times, both for ‘entertainment, having fun’ (source of the modern sense ‘joy, delight’), and in the more specific sense ‘musical entertainment’ (from which we get the ‘unaccompanied part-song’ of glee clubs). It survived healthily into the 15th century but then went into long-term decline. By the 17th century it seems virtually to have become extinct.

However, in 1755 Dr Johnson in his Dictionary said that it was ‘not now used except in ludicrous writing, or with some mixture of irony and contempt’, signalling the start of a revival which got fully under way towards the end of the 18th century. How and why it came back from the dead in this way is not known. Its source was Germanic *gliujam.
buxom (adj.): late 12c., buhsum "humble, obedient," from Proto-Germanic *buh- stem of Old English bugen "to bow" (see bow (v.)) + -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 influenced by lusty) "plump, comely" (1580s). In Johnson [1755] the primary meaning still is "obedient, obsequious."

Used often of breasts, and by 1950s it had begun to be used more narrowly for "bosomy" and could be paired with slim (adj.). Dutch buigzaam, German biegsam "flexible, pliable" hew closer to the original sense of the English cognate.
healthy (adj.): 1550s, "being in a sound state;" also "conducive to health," from health + -y (2). Earlier in the same sense was healthsome (1530s). Related: Healthily; healthiness.
It is wrong to say that certain articles of food are healthy or unhealthy. Wholesome and unwholesome are the right words. A pig may be healthy or unhealthy while alive; but after he is killed and becomes pork, he can enjoy no health, and suffer no sickness. [Eliza Leslie, "Miss Leslie's Behaviour Book," Philadelphia, 1839]
Healthsome is from 1530s in the sense "bestowing health."
unhealthy (adj.): 1590s, "injurious to health," from un- (1) "not" + healthy (adj.). Earlier unhealthsome (1540s), unhealthful (1570s). Of persons, "sickly," it is attested from 1610s. Related: Unhealthily.