Start eating with gusto (3,2)

I believe the answer is:
dig in
(Other definitions for dig in that I've seen before include "protect himself" , "Start to eat" , "Begin eating (informal)" , "Start eating (informal)" , "Enjoy the food" .)
I believe the answer is:
dig in
(Other definitions for dig in that I've seen before include "protect himself" , "Start to eat" , "Begin eating (informal)" , "Start eating (informal)" , "Enjoy the food" .)