Dictionary

derail

verb de·rail \di-ˈrāl, dē-\

of a train : to leave its tracks

: to cause (a train) to leave its tracks

Full Definition of DERAIL

transitive verb
1
:  to cause to run off the rails
2
a :  to obstruct the progress of :  frustrate <security problems derailed the tour>
b :  to upset the stability or composure of <divorce … can seriously derail an employee — Joanne Gordon>
intransitive verb
:  to leave the rails
de·rail·ment \-mənt\ noun

Examples of DERAIL

  1. The train derailed in heavy snow.
  2. The train was derailed by heavy snow.

Origin of DERAIL

French dérailler to throw off the track, from dé- de- + rail, from English
First Known Use: 1850

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