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derailment

[dee-reyl-muh nt]
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noun
  1. the act or process of derailing.
  2. Psychiatry. loosening of associations.
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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).

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Online Etymology Dictionary, © 2010 Douglas Harper