dive into
US /daɪv ˈɪntuː/
UK /daɪv ˈɪntuː/

1.
to start doing something with a lot of energy and enthusiasm
:
•
She decided to dive into her new project with full commitment.
•
Let's dive into the details of the proposal.
2.
to jump headfirst into water
:
•
The children loved to dive into the swimming pool.
•
He took a deep breath and dove into the cold lake.