(the posterior part of a human (or animal) body from the neck to the end of the spine; "his back was nicely tanned")
(the side that goes last or is not normally seen; "he wrote the date on the back of the photograph")
(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")
((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")
(the protective covering on the front, back, and spine of a book; "the book had a leather binding")
(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")
((American football) the position of a player on a football team who is stationed behind the line of scrimmage)
(be behind; approve of; "He plumped for the Labor Party"; "I backed Kennedy in 1960")
(travel backward; "back into the driveway"; "The car backed up and hit the tree")
(give support or one's approval to; "I'll second that motion"; "I can't back this plan"; "endorse a new project")
(cause to travel backward; "back the car into the parking spot")
(support financial backing for; "back this enterprise")
(be in back of; "My garage backs their yard")
(place a bet on; "Which horse are you backing?"; "I'm betting on the new horse")
(shift to a counterclockwise direction; "the wind backed")
(establish as valid or genuine; "Can you back up your claims?")
(strengthen by providing with a back or backing)
(related to or located at the back; "the back yard"; "the back entrance")
(located at or near the back of an animal; "back (or hind) legs"; "the hinder part of a carcass")
(of an earlier date; "back issues of the magazine")
(in or to or toward a former location; "she went back to her parents' house")
(at or to or toward the back or rear; "he moved back"; "tripped when he stepped backward"; "she looked rearward out the window of the car")
(in or to or toward an original condition; "he went back to sleep")
(in or to or toward a past time; "set the clocks back an hour"; "never look back"; "lovers of the past looking fondly backward")
(in reply; "he wrote back three days later")
(in repayment or retaliation; "we paid back everything we had borrowed"; "he hit me and I hit him back"; "I was kept in after school for talking back to the teacher")