Fight tooth and nail
Meaning
Struggle vigorously and aggressively to achieve something.
Usage
Often used when describing defenders of a cause or individuals resisting against odds.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Evokes literal animal fights where opponents used their teeth and claws.
Dates back to the early 1600s in English literature to depict tenacious battle scenes.