Escalate
来自Big Physics
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1920s (in the sense ‘travel on an escalator’): back-formation from escalator.
wiktionary
Back-formation from escalator.
etymonline
escalate (v.)
1922, "to use an escalator," back-formation from escalator, replacing earlier verb escalade (1801), from the noun escalade. Escalate came into general use with a figurative sense of "raise" from 1959 (intrans.), originally in reference to scenarios for possible nuclear war. Related: Escalated; escalating. Transitive figurative sense is by 1962.
