back up

Verb

• become or cause to become obstructed
  • The leaves clog our drains in the Fall
    
  • The water pipe is backed up
    

• 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?
    

• move backwards from a certain position
  • The bully had to back down
    

• give moral or psychological support, aid, or courage to
  • She supported him during the illness
    
  • Her children always backed her up
    

Related words

• Synonyms: 
  clog , choke off , clog up , congest , choke , foul , back , back off , back down , support