adv.
With every available resource; with unrelenting effort: "Bureaucrats would correctly see this as a curb on their power and would fight tooth and nail against it" (George R. Packard).
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.