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back definition

  1. the posterior part of a human (or animal) body from the neck to the end of the spine
  2. the part of something that is furthest from the normal viewer
  3. (football) a person who plays in the backfield
  4. the part of a garment that covers the back of your body
  5. a support that you can lean against while sitting
  6. (American football) the position of a player on a football team who is stationed behind the line of scrimmage
  7. be behind; approve of
  8. travel backward
  9. cause to travel backward
  10. support financial backing for
  11. be in back of
  12. shift to a counterclockwise direction
  13. establish as valid or genuine
  14. strengthen by providing with a back or backing
  15. related to or located at the back
  16. located at or near the back of an animal
  17. of an earlier date
  18. in or to or toward a former location
  19. at or to or toward the back or rear
  20. in or to or toward an original condition
  21. in or to or toward a past time
  22. in reply
  23. in repayment or retaliation
來源 : wordnet