TOOTH-AND-CLAW

characterized by hard, ferocious or determined fighting. —HEV Approved Glossary

characterized by hard, ferocious or determined fighting. And you know, that if that company was run by an individual thoroughly indoctrinated in rugged individualism and dog-eat-dog and the tooth-and-claw nature of society, that's exactly what would happen. -Rugged Individualism (30 Aug. 55)

characterized by hard, ferocious or determined fighting.characterized by the need of fighting tooth-and-claw, that is, fighting with great determination and effort (against someone).with great ferocity; fighting as hard as possible.