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English - English (Wordnet) dictionary
back up
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  • become or cause to become obstructed
    • The leaves clog our drains in the Fall
    • The water pipe is backed up
  • make a copy of (a computer file) especially for storage in another place as a security copy
    • You'd better back up these files!
  • establish as valid or genuine
    • Can you back up your claims?
  • move backwards from a certain position
    • The bully had to back down
  • give moral or psychological support, aid, or courage to
    • She supported him during the illness
    • Her children always backed her up
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