- 1(of a train) to leave the track; to make a train do this The train derailed and plunged into the river. derail something
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- 2(figurative) This latest incident could derail the peace process.
derail
verbNAmE//dɪˈreɪl//
[intransitive, transitive]Verb Forms present simple I / you / we / they derail he / she / it derails
past simple derailed
-ing form derailing
noun [countable, uncountable]See derail in the Oxford Advanced Learner's Dictionary
Check pronunciation: derail