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Houghton Mifflin

back·up  audio  (bkp) KEY 

NOUN:
    1. A reserve or substitute.
    2. Computer Science A copy of a program or file that is stored separately from the original.
    1. Support or backing.
    2. Music A background accompaniment, as for a performer.
  1. An overflow or accumulation caused by clogging or by a stoppage: a backup in the sink; a backup of traffic at the drawbridge.
ADJECTIVE:
Extra; standby: a backup pilot.



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