Go off the rails

Do you know the English expression “to go off the rails“? Read the conversation below. Can you guess the meaning?

Helen: What happened to your son? I heard he got arrested last week.

Gary: Yes, he did. He went off the rails a few years ago and we’ve been having trouble with him ever since.

Does it mean:

a) to start acting badly

b) to get lost

c) to steal things

d) to start hitting people

The answer is below!↓

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Answer: a) to start acting badly