go off the rails

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

误入歧途, 脱离正轨

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.
父母离婚后,他真的开始误入歧途
The project seemed to go off the rails when the main manager left.
当主要经理离开时,项目似乎脱离了正轨