eat vs dig in

eat and dig in both are verbs.

Word	Noun	Adjective	Verb	Adverb
eat	No	No	Yes	No
dig in	No	No	Yes	No

As verbs, dig in is a hyponym of eat; that is, dig in is a word with a more specific, narrower meaning than eat:

eat (verb)	dig in (verb)
cause to deteriorate due to the action of water, air, or an acid	eat heartily
take in solid food	occupy a trench or secured area
eat a meal; take a meal
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way