spine; backbone; spinal column

back (of the body)

business suit

seam down the back (of clothing)

backing; support (from behind the scenes)

breach of trust; malfeasance; malpractice; misappropriation

back; rear

standing on tiptoe and stretching one's back to make oneself taller; stretching oneself

number on back of player's shirt; uniform number; shirt number

to carry on one's back

backstroke (swimming)

betrayal; infidelity