'back up' definitions:

Definition of 'back up'

(from WordNet)
verb
Give moral or psychological support, aid, or courage to; "She supported him during the illness"; "Her children always backed her up" [syn: support, back up]
verb
Move backwards from a certain position; "The bully had to back down" [syn: back up, back off, back down]
verb
Establish as valid or genuine; "Can you back up your claims?" [syn: back, back up]
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!"
verb
Become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up" [syn: clog, choke off, clog up, back up, congest, choke, foul] [ant: unclog]

Definition of 'back up'

From: GCIDE
  • back up \back" up\, v. i.
  • 1. to move in a reverse direction; -- used of vehicles or animals. [PJC]
  • 2. to accumulate due to a blockage of flow; as, a traffic backup due to an accident; a sewage backup. [PJC]

Definition of 'back up'

From: GCIDE
  • back up \back" up\, v. t.
  • 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. [PJC]
  • 2. (Computers) to make a backup[5] of; as, the sysop backed up the purchasing data files every night. [PJC]

Words containing 'back up'