dig in

US /dɪɡ ɪn/
UK /dɪɡ ɪn/
"dig in" picture
1.

start eating enthusiastically

:
The moment the food was served, everyone started to dig in.
Don't wait for me, just dig in!
2.

work hard at something

:
We need to dig in and finish this project by Friday.
If you want to succeed, you have to be willing to dig in.