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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(1) Pay somebody back in his own coin. 
(2) Lying rides upon debt’s back.
(3) No one can call back yesterday.
(4) Ill comes often on the back of worse.
(5) One cannot put back the clock.
(6) Scratch my back and I'll scratch yours.
(7) Time past cannot be called back again.
(8) One misfortune rides upon another’s back.
(9) Poverty on an old man’s back is a heavy burden.
(10) Misers put their back and their belly into their pockets.
(11) A nice wife and a back door will soon make a rich man poor.
(12) When an opportunity is neglected, it never comes back to you.
(13) Her hair was tied back with a black ribbon.
(14) The back of my neck throbbed painfully.
(15) Straighten your back - try not to slouch.
(16) She fell back in horror/disgust.
(17) Macmillan wrote back saying that he could certainly help.
(18) They were ordered to strike back.
(19) She stood back and admired her handiwork.
(20) Your hair is sticking out in the back.
(21) The film looks back at Spain's glorious past. Sentencedict.com
(22) She sent back her breakfast tray untouched.
(23) Can you back your story with facts?
(24) I walk back after work everyday.
(25) I will be back within an hour.
(26) What you lose on the swings you gain (or get back) on the roundabouts.
(27) As soon as you have drunk, you turn your back upon the spring.
(28) All the treasures of the earth would not bring back one lost moment.
(29) A good book is a best friend who never turns his back upon us.
(30) Those who foolishly seek power by riding on the back of the tiger and up inside.
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.