dig into
phrasal verbdig into something 
- (informal) to start to eat food with enthusiasm- She dug into her bowl of pasta.
 
- to push or rub against your body in a painful or uncomfortable way- His fingers dug painfully into my arm.
- I could feel the teeth dig into my skin.
 
- to find out information by searching or asking questions- Will you dig a little into his past and see what you find?
- He was unwilling to dig into Sylvia's past.
 
dig something into something 
- to mix soil with another substance by digging the two substances together
- to push or press something into something else- She dug her hands deeper into her pockets.
- He dug his fork into the steak.