derailment

[dee-reyl-muh nt]

Origin of derailment

1940–45; derail + -ment, or < French déraillement
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for derailment
n.

1850, from French déraillement, from dérailler "to go off the rails" (see derail).

Online Etymology Dictionary, © 2010 Douglas Harper