Tooth And Nail Meaning

(idiomatic) Viciously; with all one's strength or power; without holding back.

Example:   For a century, the two families fought tooth and nail over control of the land.
a. 1884, Charles Reade, 1887, Charles L. Reade, Compton Reade, Charles Reade, Dramatist, Novelist, Journalist: A Memoir Compiled Chiefly from His Literary Remains, Volume 2, page 229:
  "I shall fight tooth and nail for international copyright and stage-right, […] ."
2007, Patrick Bentley, The Birth of a Song, page 76:
  At that time, I was young in the Lord, stood firm on what I believed, and I fought tooth and nail for what I thought was right in my mind and with God.
2012 October 6, Education: Class Warfare, The Economist:
  In a second term Mr Obama’s administration is likely to press ahead with its struggle to hold for-profit colleges more accountable for their results: something the industry is fighting tooth and claw.