dig into

US /dɪɡ ˈɪntuː/
UK /dɪɡ ˈɪntuː/
"dig into" picture
1.

to start working hard and seriously on something

:
It's time to really dig into this project and get it done.
We need to dig into the data to find the root cause of the problem.
2.

to eat a large amount of food with enthusiasm

:
After a long hike, we were ready to dig into a hearty meal.
The children couldn't wait to dig into the birthday cake.