Antonym: fore, forth, front. Similar words: back up, back on, back of, cut back, back away, hold back, set back, pay back. Meaning: [bæk] 
n. 1. the posterior part of a human (or animal) body from the neck to the end of the spine 2. the side that goes last or is not normally seen 3. the part of something that is furthest from the normal viewer 4. (football) a person who plays in the backfield 5. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord 6. the protective covering on the front, back, and spine of a book 7. the part of a garment that covers the back of your body 8. a support that you can lean against while sitting 9. the position of a player on a football team who is stationed behind the line of scrimmage. v. 1. be behind; approve of 2. travel backward 3. give support or one's approval to 4. cause to travel backward 5. support financial backing for 6. be in back of 7. place a bet on 8. shift to a counterclockwise direction 9. establish as valid or genuine 10. strengthen by providing with a back or backing. adj. 1. related to or located at the back 2. located at or near the back of an animal 3. of an earlier date. adv. 1. in or to or toward a former location 2. at or to or toward the back or rear 3. in or to or toward an original condition 4. in or to or toward a past time 5. in answer 6. in repayment or retaliation.
n. 1. the posterior part of a human (or animal) body from the neck to the end of the spine 2. the side that goes last or is not normally seen 3. the part of something that is furthest from the normal viewer 4. (football) a person who plays in the backfield 5. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord 6. the protective covering on the front, back, and spine of a book 7. the part of a garment that covers the back of your body 8. a support that you can lean against while sitting 9. the position of a player on a football team who is stationed behind the line of scrimmage. v. 1. be behind; approve of 2. travel backward 3. give support or one's approval to 4. cause to travel backward 5. support financial backing for 6. be in back of 7. place a bet on 8. shift to a counterclockwise direction 9. establish as valid or genuine 10. strengthen by providing with a back or backing. adj. 1. related to or located at the back 2. located at or near the back of an animal 3. of an earlier date. adv. 1. in or to or toward a former location 2. at or to or toward the back or rear 3. in or to or toward an original condition 4. in or to or toward a past time 5. in answer 6. in repayment or retaliation. 
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(271) No one can call back yesterday. Yesterday will not be called again.
(272) I tie my hair up because I don't like it straggling down my back.
(273) Home. I'll go home. And I'll think of someway to get him back. After all, tomorrow is another day.
(274) There used to be a big and beautiful garden at the back of their house.
(275) They shone the spotlight on a woman waving at the back of the audience.
(276) When the days become old photo when the old photos become memories, we became back to back the pedestrians, along different directions, the stubborn one step away from Athens, no, no Rome, no way back.
(277) We had seats in the front/back row of the theatre.
(278) Love and knowledge, so far as they were possible, led upward toward the heavens. But always pity brought me back to earth. Echoes of cries of pain reverberate in my heart. Children in famine, victims tortured by oppressors, helpless old people a burden to their sons, and the whole world of loneliness, poverty, and pain make a mockery of what human life should be. I long to alleviate this evil, but I cannot, and I too suffer.
(279) We cannot back down at the first sign of opposition.
(280) I can't think of her name - it'll come back to me later.
(281) My mind travelled back to a hot sultry day in the little town.
(282) Keep your receipt in case you want to bring it back.
(283) The car in front suddenly stopped and I went into the back of it.
(284) When you take the scissors(Sentence dictionary), remember to put them back.
(285) Life is like a one way street, none of them leads back.
(286) The small church of San Michel is tucked away in a narrow back street of Port-au-Prince.
(287) I, in my turn, became embarrassed and huffy and told her to take the money back.
(288) The company's profits eased back from ￡15.million to ￡14.7 million.
(289) You never lose by loving. You always lose by holding back.
More similar words: back up, back on, back of, cut back, back away, hold back, set back, pay back, call back, keep back, go back to, draw back, look back, give back, go back on, backyard, feedback, bring back, fall back on, background, double back, back and forth, date back to, quarterback, tobacco, bacteria, sack, rack, pack, track.