The detectives 'dug into' his past and learned that he had once lived in another country.
Her fingernails 'dug into' my hand. = She 'dug' her fingernails 'into' my hand.
The salesman 'dug in his heels' and refused to lower the price any further.
(..) - Jake. Jake! - He's in alpha. Come on back, kid. Come on. That's it. There you go. There you go, there you go. You're okay. You're okay. Damn! You were dug in like a tick. - Is the avatar safe? - Yeah, Doc. And you are not gonna believe where I am. The last thing we see is this Marine's ass (..)2009 Avatar