Definition of Back-up

Verb

• become or cause to become obstructed
  "The leaves clog our drains in the Fall"
  "The water pipe is backed up"
  clog - choke off - clog up congest choke foul
• 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?"
  back
• move backwards from a certain position
  "The bully had to back down"
  - back off - back down
• give moral or psychological support, aid, or courage to
  "She supported him during the illness"
  "Her children always backed her up"
  support

• Scrabble® score of the back_up (16)
• Word Chums® score of the back_up (23)
• Words With Friends® score of the back_up (20)