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derailment

[dee-reyl-muh nt] /diˈreɪl mənt/
noun
1.
the act or process of derailing.
2.
Origin of derailment
1940-1945
1940-45; derail + -ment, or < French déraillement
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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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
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