1. to begin again from the beginning, especially after a failure or interruption
After the company went bankrupt, he decided to start over in a new city.
Depois que a empresa faliu, ele decidiu começar de novo em uma nova cidade.
2. to restart a process, task, or activity from its initial point
I made a mistake on the essay, so I had to start over.
Cometi um erro no ensaio, então tive que começar de novo.