turn over a new leaf
US /tɜrn ˈoʊvər ə nu lif/
UK /tɜrn ˈoʊvər ə nu lif/
1.
to start to behave in a better or more responsible way
:
•
After his release from prison, he promised to turn over a new leaf.
•
I'm going to turn over a new leaf and start exercising regularly.