Student or Learner
go off the rails
informal : to lose control and start to behave in a way that is not normal or acceptable
▪ He was a promising student but he went off the rails after he started taking drugs.
▪ The government has gone (completely) off the rails.
Can I say "ran" in place of went and "run" instead of gone? Both AE and BE speakers use the phrase "off the rails," don't they?