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Definitions of back up
  1. verb
    become or cause to become obstructed
  2. verb
    establish as valid or genuine
    "Can you back up your claims?"

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  3. verb
    move backwards from a certain position

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  4. verb
    give moral or psychological support, aid, or courage to

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  5. verb
    make a copy of (a computer file) especially for storage in another place as a security copy
    "You'd better back up these files!"
    type of:
Explanation of back up
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