on their own; independently
Tiene que trabajar por su cuenta.
He has to work on his own.
Él le aconsejó que no fuera allí por su cuenta.
He advised her not to go there on her own.
El jefe escuchó de ti por su cuenta de cuando estuviste en Shanghai.
The boss heard about you through his own channels from when you were in Shanghai.
— El imperio de las sombras (2016)
Tom investigó por su cuenta.
Tom investigated on his own.
Mejorará por su cuenta en dos semanas.
It will improve on its own in two weeks.
He studied on his own.
Tomás trabaja por su cuenta.
Tomás works on his own.
No puedo creer que el niño haya venido a Tokio por su cuenta.
I can’t believe the boy came to Tokyo on his own.