by degrees
US /baɪ dɪˈɡriːz/
UK /baɪ dɪˈɡriːz/

1.
gradualmente, poco a poco
gradually; little by little
:
•
The patient's health improved by degrees.
La salud del paciente mejoró gradualmente.
•
They learned the new language by degrees.
Aprendieron el nuevo idioma poco a poco.