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Definition of BACK
a (1): the rear part of the human body especially from the neck to the end of the spine (2): the body considered as the wearer of clothes (3): capacity for labor, effort, or endurance (4): the back considered as the seat of one's awareness of duty or failings <get off my back>(5): the back considered as an area of vulnerability <the police officer's partner always watches his back>
b: the part of a lower animal (as a quadruped) corresponding to the human back