derail
//dɪˈreɪl//
Verb
derailInfinitive
derailPresent tense
derailedPast tense
derailedPast participle
derailingPresent participle
derailsThird-person singular
1
To cause a train or tram to leave its tracks.
The fallen tree derailed the train.
2
To obstruct or divert something from its intended course; to cause a plan, process, or discussion to fail or go off track.
The unexpected scandal derailed the politician's campaign.