fight tooth and nail

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fight tooth and nail

To fight, battle, or compete with great ferocity, vigor, and intensity. I know my brother has fought tooth and nail to be re-elected, so his victory tonight is certainly well earned. These elite troops have been selected by the royal palace to fight tooth and nail against any possible invaders.
See also: and, fight, nail, tooth

fight (somebody/something) tooth and nail

to use a lot of effort to oppose someone or achieve something We fought tooth and nail to keep our share of the business. They vowed to fight the new legislation tooth and nail.
See also: and, fight, nail, tooth

fight tooth and nail

Engage in vigorous combat or make a strenuous effort, using all one's resources. For example, I'm going to fight tooth and nail for that promotion. This expression, with its allusion to biting and scratching, was first recorded in 1576.
See also: and, fight, nail, tooth