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| de·rail [ dee ráyl ] (past and past participle de·railed, present participle de·rail·ing, 3rd person present singular de·rails) |
transitive and intransitive verb |
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| Definition: |
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1. come off rails: to make a train or tram come off the rails, or come off the rails
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2. send or go off course: to send something off course, or go off course
 plans to derail the Republican campaign
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| [Mid-19th century. < French dérailler< rail (see rail1)] |
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| de·rail·ment noun |
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