Bone-Crunching Meaning

(idiomatic) Very violent or hard.

Example: 2009 May 28, Penelope Green, “Jersey Girls, Nesting”[1], New York Times:
  Indeed, when baby-voiced Teresa describes the bone-crunching finishes in her new home, a 12,000-square-foot French chateau simulacrum that’s “all granite, marble and onyx,” and avers her commitment to the brand-spanking new (“I just skeeve looking at other people’s houses,” she says.
2009 November 27, “Jimi Hendrix's Voodoo Child has 'best guitar riff'”[2], BBC:
  The bone-crunching AC/DC classic Back In Black landed at number six, followed by Metallica's Enter Sandman and the chiming riff of The Beatles' Day Tripper at eight.
2011‎ April 2, Steve Brenner, “Joey will defy pack of Wolves”, The Sun:
  Back in August, the Toon ace was kicked from pillar to post by Karl Henry in a bone-crunching midfield battle at Molineux.