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English definition of “go off the rails”

go off the rails

informal
to start behaving in a way that is not generally acceptable , especially dishonestly or illegally : He went off the rails in his first year at university .Bad and wrong behaviourDisobedientObeying and breaking the lawObedient and compliant
(Definition of go off the rails from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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