back-up

• n.
  • an accumulation caused by clogging or a stoppage

    同义词： backup

  • someone who takes the place of another (as when things get dangerous or difficult)

    同义词： stand-in substitute relief reliever backup backup man fill-in

  • a subordinate musical part; provides background for more important parts

    同义词： accompaniment musical accompaniment backup support

  • (computer science) a copy of a file or directory on a separate storage device

    同义词： backup computer backup

  • the act of providing approval and support

    同义词： backing backup championship patronage

• v.
  • give moral or psychological support, aid, or courage to

    同义词： support back up

  • move backwards from a certain position

    同义词： back up back off back down

  • establish as valid or genuine

    同义词： back back up

  • make a copy of (a computer file) especially for storage in another place as a security copy

    同义词： back up

  • become or cause to become obstructed

    同义词： clog choke off clog up back up congest choke foul

以上来源于: WordNet