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Wiktionary
dig in

vb. 1 (context idiomatic English)To begin eating. 2 To make a burst of hard work.

WordNet
dig in
  1. v. occupy a trench or secured area; "The troops dug in for the night" [syn: entrench]

  2. eat heartily; "The food was placed on the table and the children pitched in" [syn: pitch in]

Wikipedia
Dig In

"Dig In" is a song by Lenny Kravitz, and the lead single from his sixth studio album, Lenny. It was released in August 2001. It was used in promos by the National Basketball Association for the 2002 NBA Playoffs, as well as the ending theme for the film Returner.

Usage examples of "dig in".

Stratton stood about fifteen feet above the dig in a skylight-lit hall the size of a football field.

He'd wanted to dig in his roots, as he'd never been able to do as a child, and provide places for others to do the same.

They lock on, dig in, and secrete a fluid which liquefies flesh and bone.