To Kill a Mockingbird

In the following quu=otation, what is the meaning of "tooth and nail," and what type of literary expression is this?

" I would not fight publicly for Atticus, but the family was private ground. I would fight anyone from a third cousin upwards tooth and nail." (chapter 10)

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Last updated by jill d #170087
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Tooth and nail would mean with everything you've got....... this is an idiom.