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escalate[escalate 词源字典]

escalate: [20] Escalate is a back-formation from escalator [20], which was originally a tradename for a moving staircase first made in the USA around 1900 by the Otis Elevator Company. This in turn seems to have been coined (probably on the model of elevator) from escalade [16], a term in medieval warfare signifying the scaling of a fortified wall, which came via French and Spanish from medieval Latin scalāre, source of English scale ‘climb’. Escalate originally meant simply ‘ascend on an escalator’; the metaphorical sense ‘increase’ developed at the end of the 1950s.
[escalate etymology, escalate origin, 英语词源]