Definition of go off the rails in English:

go off the rails

phrase

informal
  • Begin behaving in an uncontrolled or unacceptable way.

    ‘sport saved them from going off the rails as youngsters’
    • ‘As his acting career began to take off, he began to go off the rails.’
    • ‘They added he seemed to have gone off the rails and for a ‘bright lad,’ like him, it did not seem right.’
    • ‘The important information is that while he may have gone off the rails in the past, he's clean and sober now.’
    • ‘We have gone right off the rails in this country.’
    • ‘He became depressed because of the situation, turned to binge drinking and his life went off the rails.’
    • ‘Given the amount of crime committed by young people, it is sometimes tempting to think that a whole generation has gone off the rails.’
    • ‘He had come into the first team and played a few games at just 16 but like a few of the lads he totally lost the place and went off the rails.’
    • ‘I know I went off the rails seriously enough, that had my parents been famous, I would have been featured in the pages of National Enquirer.’
    • ‘You start looking back and trying to work out reasons why your child is going off the rails.’
    • ‘He had fully admitted his role in the offences and had seemingly gone off the rails during the period of offences.’