turn over a new leaf
US /tɜrn ˈoʊvər ə nu lif/
UK /tɜrn ˈoʊvər ə nu lif/

1.
virar a página, mudar de vida
to start to behave in a better or more responsible way
:
•
After his release from prison, he promised to turn over a new leaf.
Após sua libertação da prisão, ele prometeu virar a página.
•
I'm going to turn over a new leaf and start exercising regularly.
Vou virar a página e começar a me exercitar regularmente.