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Kenneth G. Wilson (1923–).  The Columbia Guide to Standard American English.  1993.
 
escalate (v.)
 
 
Escalate is a Standard back-formation from escalator and means “to increase or rise,” as in The rate of unemployment has escalated rapidly this spring. Compare DE-ESCALATE.  1
 
 
The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press.

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