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tooth and nail

with all one's resources or energy; fiercely:
We fought tooth and nail but lost.
1525-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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tooth-nail in Culture

tooth and nail definition

To fight “tooth and nail” is to fight with the intensity and ferocity of a wild animal: “The resistance forces fought the invading troops tooth and nail.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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