sward (n.)youdaoicibaDictYouDict[sward 词源字典]
"grass-covered ground," c. 1300, from Old English sweard "skin, hide, rind" (of bacon, etc.), from Proto-Germanic *swarthu- (cognates: Old Frisian swarde "skin of the head," Middle Dutch swarde "rind of bacon," Dutch zwoord "rind of bacon," German Schwarte "thick, hard skin, rind," Old Norse svörðr "walrus hide"). Meaning "sod, turf" developed from the notion of the "skin" of the earth (compare Old Norse grassvörðr, Danish grønsvær "greensward").[sward etymology, sward origin, 英语词源]