back, dorsum -- (the posterior part of a human (or animal) body from the neck to the end of the spine; "his back was nicely tanned")
rear, back -- (the side that goes last or is not normally seen; "he wrote the date on the back of the photograph")
back, rear -- (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")
back -- ((football) a person who plays in the backfield)
back -- (travel backward; "back into the driveway"; "The car backed up and hit the tree")
second, back, endorse, indorse -- (give support or one's approval to; "I'll second that motion"; "I can't back this plan"; "endorse a new project")
back -- (cause to travel backward; "back the car into the parking spot")
back -- (support financial backing for; "back this enterprise")
back -- (be in back of; "My garage backs their yard")
bet on, back, gage, stake, game, punt -- (place a bet on; "Which horse are you backing?"; "I'm betting on the new horse")
back -- (shift to a counterclockwise direction; "the wind backed")
back, back up -- (establish as valid or genuine; "Can you back up your claims?")
back -- (strengthen by providing with a back or backing)
Overview of adj back
The adj back has 3 senses
back -- (related to or located at the back; "the back yard"; "the back entrance")
back, hind, hinder -- (located at or near the back of an animal; "back (or hind) legs"; "the hinder part of a carcass")
back -- (of an earlier date; "back issues of the magazine")
Overview of adv back
The adv back has 6 senses
back -- (in or to or toward a former location; "she went back to her parents' house")
back, backward, backwards, rearward, rearwards -- (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")
back -- (in or to or toward an original condition; "he went back to sleep")
back, backward -- (in or to or toward a past time; "set the clocks back an hour"; "never look back"; "lovers of the past looking fondly backward")
back -- (in reply; "he wrote back three days later")
back -- (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")