Definition of back verb from the Oxford Advanced American Dictionary

     

    back

     verb
    verb
    NAmE//bæk//
     
    Verb Forms present simple I / you / we / they back
     
    he / she / it backs
     
    past simple backed
     
    -ing form backing
     
     
    jump to other results
    move backward
  1. 1[intransitive, transitive] to move or make something move backward + adv./prep. He backed against the wall, terrified. to back out of a parking space back something + adv./prep. If you can't drive in forward, try backing it in. compare reverse
  2. support
  3. 2[transitive] back somebody/something to give help or support to someone or something Her parents backed her in her choice of career. Doctors have backed plans to raise the tax on cigarettes. The program of economic reform is backed (= given financial support) by foreign aid. a United Nations-backed peace plan
  4. bet money
  5. 3 [transitive] back something to bet money on a horse in a race, a team in a competition, etc. I backed the winner and won fifty dollars.
  6. music
  7. 4[transitive] back something to play or sing music that supports the main singer or instrument see also backing
  8. cover back
  9. 5[transitive] back something (with something) [usually passive] to cover the back of something in order to support or protect it
  10. be behind
  11. 6 [transitive, usually passive] back something to be located behind something The house is backed by fields.
  12. Phrasal Verbsback away (from somebody/something)back down (on/from something)back offback off (from something)back onto somethingback out (of something)back upback somebody/somethingupback somethingup
See the Oxford Advanced Learner's Dictionary entry: back