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'back' - used as an adjective
1. related to or located at the back
the back yard
the back entrance
2. located at or near the back of an animal
back legs
3. of an earlier date
back issues of the magazine

'back' - used as a adverb
4. in or to or toward a former location
she went back to her parents' house
5. at or to or toward the back or rear
he moved back
6. in or to or toward an original condition
he went back to sleep
7. in or to or toward a past time
set the clocks back an hour
never look back
8. in answer
he wrote back three days later
9. 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

'back' - used as a noun
10. the posterior part of a human (or animal) body from the neck to the end of the spine
his back was nicely tanned
11. the side that goes last or is not normally seen
he wrote the date on the back of the photograph
12. the part of something that is furthest from the normal viewer
he stood at the back of the stage
13. (football) a person who plays in the backfield
14. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
the fall broke his back
15. the protective covering on the front, back, and spine of a book
16. the part of a garment that covers the back of your body
they pinned a 'kick me' sign on his back
17. a support that you can lean against while sitting
the back of the dental chair was adjustable
18. the position of a player on a football team who is stationed behind the line of scrimmage

'back' - used as a verb
19. be behind; approve of
I backed Kennedy in 1960
20. travel backward
back into the driveway
The car backed up and hit the tree
21. give support or one's approval to
I can't back this plan
22. cause to travel backward
back the car into the parking spot
23. support financial backing for
back this enterprise
24. be in back of
My garage backs their yard
25. place a bet on
Which horse are you backing?
26. shift to a counterclockwise direction
the wind backed
27. establish as valid or genuine
Can you back up your claims?
28. strengthen by providing with a back or backing

derived forms
1. Back / Plural
2. Back / Past
3. Back / Third Person
4. Back / Present Participle
See also
  • front
  • ahead
  • advance
  • veer
    Past Words of the day
    Who Said that ?
    Man is the animal that intends to shoot himself out into interplanetary space, after having given up on the problem of an efficient way to get himself five miles to work and back each day. - Click here to find out.
    Fact of the day
    When Alexander Graham Bell invented the telephone back in 1876, only six phones were sold in the first month.