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trenchant (adj.)
[trenchant 词源字典]
early 14c., "cutting, sharp," from Old French
trenchant
"cutting, sharp" (literal and figurative), present participle of
trenchier
"to cut" (see
trench
). Figurative sense in English is from c. 1600.
[trenchant etymology, trenchant origin, 英语词源]