The definition of stuck in a rut is:
(idiom) in a boring lifestyle that never changes
Rodney felt that he was stuck in a rut, so he decided to go back to University to study dentistry.
A: Are you okay?
B: No, I feel really depressed these days.
A: Why is that?
B: I feel like I’m stuck in a rut because I don’t know what to do with my life.
After losing his job, Bertrand was stuck in a rut because he couldn’t find a job and didn’t want to go back to school.
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