dig into

dig in(to) (something)

1. Literally, to dig a hole into something, such as the ground. I had to dig into the soil and create a hole for the flowers.
2. To investigate in an attempt to uncover information about someone or something, often negative information. I've been digging into the archives for any information on her past, but I haven't found a single thing.
3. To start eating, often eagerly or excitedly. Well, dig in before your dinner gets cold. Mom's lasagna is always so good—I can't wait to dig into it!
4. To work energetically. Thanks to the whole department digging in, we were able to get that report finished on time.
5. To poke or prod someone or something. In this usage, a noun or pronoun can be used between "dig" and "in" to refer either to the person or thing being jabbed or to the thing doing the jabbing. The dog might bite you if you keep digging it in its side like that. I dug a toothpick into the cake to see if it was fully cooked.
6. To create protective trenches, as in trench warfare. Once we're dug in here, I think we'll be able to hold this area.
7. To place one's hands in something, usually in an attempt to find something. Here, dig into my purse and see if you can find my sunglasses.
See also: dig
Farlex Dictionary of Idioms.

dig something into something

 and dig something in
to stab or jab something into something. Dig your fork into that heavenly cake! He dug in his fork.
See also: dig
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

dig into

v.
1. To plunge the hands into something, especially to search for something: She dug into her bookbag and pulled out a pen.
2. To push something into some other thing: I dug two posts into the ground and hung a volleyball net between them.
See also: dig
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • dig in
  • dig in(to) (something)
  • dig down
  • dig (something)
  • dig (deep) into (one's) pocket(s)
  • dig this
  • give (someone) a dig
  • give a dig
  • give someone a dig
  • tunnel through