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unbeaten (adj.)
[unbeaten 词源字典]
late 13c., "not beaten or struck," from
un-
(1) +
beaten
. In the sense of "undefeated" it is first recorded 1757. Old English had
ungebeaten
"unwrought, unstruck."
[unbeaten etymology, unbeaten origin, 英语词源]
[unbeaten 词源字典]