Definition of derail in English:



[with object]
  • 1Cause (a train or tram) to leave its tracks accidentally.

    ‘a train was derailed after it collided with a herd of cattle’
    • ‘A train was derailed after a wall collapsed on to the track, the gable end of a house crumbled on to a car, trees toppled over and garden fences were blown away.’
    • ‘Several strong earthquakes shook north-western Japan within a span of minutes last night, toppling homes, causing blackouts, cutting water and gas services, and derailing a bullet train.’
    • ‘The typhoon brought downpours and strong winds, destroying houses and important cultural properties, derailing a train and disrupting transportation services across the country.’
    • ‘Fortunately the train was not derailed and no one was injured, although the train driver needed treatment for shock.’
    • ‘A strong earthquake shook northwest Japan yesterday, destroying homes, derailing a bullet train and cutting water and power supplies.’
    • ‘All nine coaches were derailed, but continued upright for half a mile before colliding head-on with a coal train.’
    • ‘The company has imposed speed restrictions across some of its network because of fears that tracks could buckle in the heat and derail trains.’
    • ‘She said there were two big questions that needed to be answered with urgency: how the car came to be on the track at the time and how the train was derailed in such a catastrophic way.’
    • ‘He believes vandals could easily lift any of the sections of rail, or bolts, dumped by the railside and derail a train by laying them across the tracks.’
    • ‘After the impact the passenger train was derailed, but remained upright until it travelled over a set of points which deflected it into the path of the freight train travelling in the opposite direction.’
    • ‘Although the three carriages that made up the local train was derailed in the collision, its 30 passengers were only slightly hurt.’
    • ‘Three trains were derailed due to the heavy rainfall of the past few days.’
    • ‘They are targeting areas where children regularly play ‘chicken’ across busy lines, throw stones at passing trains and block the line with debris, which can derail trains.’
    • ‘If a train is derailed at high speed the chances of it colliding with a train coming from the opposite direction are significantly high by virtue of the minimal separation between each one.’
    • ‘There may not have been a case yet where a train was derailed by objects deliberately left on the line by young pranksters.’
    • ‘The returning train was derailed by the drunken pachyderms, and by the time the line was cleared and we arrived back in the capital, I was feeling spectacularly rough.’
    • ‘This is why, for instance, people are inclined to overestimate the risks of travelling by rail, because of the very extensive reporting when a train is derailed and a number of passengers are killed.’
    • ‘Commuters faced more misery on Thursday after a train was derailed just outside Bedford.’
    • ‘Rail chiefs launched an inquiry after two quarry trains were derailed on the same day.’
    • ‘The train was not derailed and remained on the track.’
    destroy, put an end to, bring to an end, be the end of, end, extinguish, dash, quell, quash, ruin, wreck, shatter, smash, crush, scotch
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    1. 1.1no object (of a train or tram) accidentally leave the tracks.
      ‘the trams had a tendency to derail on sharp corners’
      • ‘And as many as 200 people have been evacuated in southern California after a freight train derailed today.’
      • ‘On the 35-car train, 10 cars derailed, according to railroad officials.’
      • ‘The train then derailed into the path of an oncoming freight train.’
      • ‘My concern was for the people who were on board the train, it would have been unthinkable if the train had derailed.’
      • ‘Suddenly, somehow, in a split-second, the train derailed.’
      • ‘Officials say at least three of the train's cars derailed.’
      • ‘That actually increases the risk of the rail breaking and leading to a train derailing.’
      • ‘A witness said the outgoing tram derailed after the crash.’
      • ‘The rail cars derailed and crashed and crews were sent to battle the small blazes that started.’
      • ‘Unfortunately, her train derailed on the way to the airport.’
      • ‘At least now we have confirmed that two people have died when those train cars derailed.’
      • ‘The train had derailed but remained upright, resulting in at least ten serious injuries.’
      • ‘Thousands of litres of heavy industrial oil spilled into the lake after 43 train cars derailed on Wednesday morning.’
      • ‘Heavy rain was last night blamed for causing a landslide that led to a passenger train derailing on one of Britain's busiest routes.’
      • ‘The train car derailed, and a crater was left in the track bed.’
      • ‘So far, he's not aware of a train derailing or crashing as a result of such ‘pranks’.’
      • ‘The train derailed yesterday, injuring more than 100 passengers, six of them critically.’
      • ‘Rail passengers were warned last night to expect delays over the next four days after a freight train derailed near the Scottish border.’
      • ‘No one was seriously injured when 11 cars and four locomotives derailed about 9: 40 a.m.’
      • ‘The tram derailed and crashed into the wall of a major downtown department store.’
    2. 1.2with object Obstruct (a process) by diverting it from its intended course.
      ‘the plot is seen by some as an attempt to derail the negotiations’
      • ‘Both sides said they are committed to peace talks and analysts say the blast could impede but not derail the process.’
      • ‘When those actions came to light this February, councillors erupted in anger, almost derailing the whole process once again.’
      • ‘And they're going to do whatever they can do to derail the democratic process.’
      • ‘Which leads to another question: Was the robbery intended to derail the peace process?’
      • ‘He makes an excellent case that it was created in ‘an obvious attempt to derail the peace process.’’
      obstruct, impede, interfere with, hinder, hamper, block, interrupt, hold up, hold back, stand in the way of, frustrate, thwart, baulk, inhibit, hamstring, sabotage, encumber, restrain, slow, slow down, retard, delay, stonewall, forestall, arrest, check, stop, halt, stay, restrict, limit, curb, put a brake on, bridle, fetter, shackle
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Mid 19th century: from French dérailler, from dé- (expressing removal) + rail ‘rail’.