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Definition of Off the rails
1. Adverb. (idiomatic) In an abnormal manner, especially in a manner that causes damage or malfunctioning ¹
2. Adverb. (idiomatic) Insane. ¹
3. Adverb. (idiomatic) Off the intended path. ¹
4. Adverb. (idiomatic) Out of control. ¹
¹ Source: wiktionary.com