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Definition of Back up
1. Verb. Give moral or psychological support, aid, or courage to. "Sam cannot back up Sue "; "Her children always backed her up"
Specialized synonyms: Sponsor, Buy At, Frequent, Patronise, Patronize, Shop, Shop At, Sponsor, Aid, Assist, Help, Advance, Boost, Encourage, Further, Promote, Undergird, Back, Endorse, Indorse, Second
Derivative terms: Backup, Support, Supporter, Supporter, Supportive
2. Verb. Move backwards from a certain position. "The bully had to back down"
Generic synonyms: Draw Back, Move Back, Pull Away, Pull Back, Recede, Retire, Retreat, Withdraw
Derivative terms: Backdown
3. Verb. Establish as valid or genuine. "Can you back up your claims?"
4. 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!"
Generic synonyms: Copy, Re-create
Derivative terms: Backup
5. Verb. Become or cause to become obstructed. "The water pipe is backed up"
Specialized synonyms: Gum Up, Crap Up, Block, Choke Up, Lug, Stuff, Silt, Silt Up
Generic synonyms: Block, Close Up, Impede, Jam, Obstruct, Obturate, Occlude
Derivative terms: Backup, Clog, Congestion, Congestive
Antonyms: Unclog
Definition of Back up
1. Verb. (idiomatic intransitive) To move backwards, especially for a vehicle to do so. ¹
2. Verb. (idiomatic transitive) To move a vehicle backwards. ¹
3. Verb. (idiomatic intransitive) To undo one's actions. ¹
4. Verb. (idiomatic intransitive) To reconsider one's thoughts. ¹
5. Verb. (idiomatic computing transitive) To copy (data) as a security measure. ¹
6. Verb. (idiomatic transitive) To provide support or the promise of support. ¹
7. Verb. (idiomatic intransitive cricket) For the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball. ¹
8. Verb. (idiomatic intransitive cricket) For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows. ¹
9. Verb. (idiomatic intransitive of a blockage) to halt the flow or movement of something. ¹
¹ Source: wiktionary.com