The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.

Having a spine.

plural of backbone

(idiomatic) Through and through; thoroughly; entirely.

(Jamaica) A hard confection made with grated coconut and ginger.

Success is achieved by hard work, not by merely wishing for it.

Without a backbone; invertebrate. / Cowardly, spineless.

cowardice; spinelessness