n.

the posterior part of a human (or animal) body from the neck to the end of the spine

"his back was nicely tanned"

同義詞：dorsum

the side that goes last or is not normally seen

"he wrote the date on the back of the photograph"

同義詞：rear

the part of something that is furthest from the normal viewer

"he stood at the back of the stage"

同義詞：rear

(football) a person who plays in the backfield

the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

"the fall broke his back"

同義詞：spinal columnvertebral columnspinebackbonerachis

the protective covering on the front, back, and spine of a book

同義詞：bindingbook bindingcover

the part of a garment that covers the back of your body

"they pinned a `kick me' sign on his back"

a support that you can lean against while sitting

"the back of the dental chair was adjustable"

同義詞：backrest

the position of a player on a football team who is stationed behind the line of scrimmage

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