fight tooth and nail

Idioms  

1. 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.

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Example Sentences

Polly Portwin, from the Countryside Alliance, said the group would "fight tooth and nail" against the proposed law change.

From BBC

“They will fight tooth and nail over everything.”

From Barron's

"We had to fight tooth and nail for that result," said Smith.

From Barron's

“Instead, they are paying a law firm to fight tooth and nail against obligations that are clear in the settlement agreement — and that a judge has affirmed they are in violation of.”

From Los Angeles Times

"This company which has been here for more than 150 years we will fight tooth and nail to protect and maintain jobs for future generations," he said.

From BBC