go off the rails

US /ɡoʊ ɔf ðə reɪlz/
UK /ɡoʊ ɔf ðə reɪlz/
"go off the rails" picture
1.

誤入歧途, 脫離正軌

to start behaving in a way that is not acceptable or expected, especially in a wild or uncontrolled way

:
After his parents' divorce, he really started to go off the rails.
父母離婚後,他真的開始誤入歧途
The project seemed to go off the rails when the main manager left.
當主要經理離開時,項目似乎脫離了正軌