back noun

• the part of something that is furthest from the normal viewer

  "he stood at the back of the stage"

  "it was hidden in the rear of the store"
  àzụ́
• the side that goes last or is not normally seen

  "he wrote the date on the back of the photograph"
  àzụ́
• the posterior part of a human (or animal) body from the neck to the end of the spine

  "his back was nicely tanned"
  àzụ́