英语词源字典 - 在线词源网站

eighty (n.)[eighty 词源字典]: eigteti (late 13c.), from eight + -ty (1). Replacing Old English hundeahtatig, with hund- "ten." Related: Eightieth.[eighty etymology, eighty origin, 英语词源]
fourscore (n.): "eighty, four times twenty," mid-13c., "formerly current as an ordinary numeral" [OED], from four + score (n.). Archaic by the time Lincoln used it at Gettysburg in 1863. Related: Fourscorth "eightieth."