D defs.my
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Entry 4 senses · 2 variants Webster, 1913

back up

· back· up · IPA
01 v. i. to move in a reverse direction; -- used of vehicles or animals.
  1. 1.
    to move in a reverse direction; -- used of vehicles or animals.
  2. 2.
    to accumulate due to a blockage of flow; as, a traffic backup due to an accident; a sewage backup.
02 v. t. to serve as a backup{3} for (another person or persons); as, the patrolmen backed up the detectives as they went inside to make the arrest;…
  1. 1.
    to serve as a backup{3} for (another person or persons); as, the patrolmen backed up the detectives as they went inside to make the arrest; the center fielder backed up the shortstop on the play.
  2. 2.
    to make a backup{5} of; as, the sysop backed up the purchasing data files every night.(Computers)