Dig Deep Meaning

(idiomatic) To make a lot of effort with all one's resources.

Example: 2011 February 1, Phil McNultyArsenal 2-1 Everton], BBC:
  Arsene Wenger's side showed little of the style and fluidity that is their hallmark but this was about digging deep and getting the job done, qualities they demonstrated and that will serve them well as the season reaches its climax.
  If you want to join the marines, there's no room for laziness. You really have to dig deep.‎