[dig in] vt (1839) 1: to cover or incorporate by burying "dig in compost"
2: to establish in a dug defensive position "the platoon was well dug in" ~ vi 1: to establish a defensive position esp. by digging trenches
2. a: to go resolutely to work b: to begin eating
3: to hold stubbornly to a position
4: to scuff the ground for better footing while batting (as in baseball) -- dig in one's heels : to take or persist in an uncompromising position or attitude despite opposition