dig in

/D IH1 G IH0 N/
verb
  1. 1

    (colloquial) To begin eating.

  2. 2

    (colloquial) To engage in a burst of hard work.

  3. 3

    (idiomatic) To adopt a resolute state of mind.

  4. 4

    (military, also figurative in sports) To dig trenches to resist an enemy attack.

  5. 5

    To cover over by digging.