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We found 39 dictionaries with English definitions that include the word back up:
Click on the first link on a line below to go directly to a page where "back up" is defined.

General dictionaries General (23 matching dictionaries)
  1. back up: Merriam-Webster.com [home, info]
  2. back up: Oxford Dictionaries [home, info]
  3. back-up, back up: Collins English Dictionary [home, info]
  4. back up: Vocabulary.com [home, info]
  5. back up: Macmillan Dictionary [home, info]
  6. Back-Up, Back-up, back-up, back up: Wordnik [home, info]
  7. back-up, back (sth) up, back up: Cambridge Advanced Learner's Dictionary [home, info]
  8. back-up, back up: Wiktionary [home, info]
  9. back up: Dictionary.com [home, info]
  10. back up: UltraLingua English Dictionary [home, info]
  11. Back Up (Dej Loaf song), Back Up (Snoop Dogg song), Back-up, Back up: Wikipedia, the Free Encyclopedia [home, info]
  12. back-up: Cambridge International Dictionary of Phrasal Verbs [home, info]
  13. back up: Rhymezone [home, info]
  14. back up: AllWords.com Multi-Lingual Dictionary [home, info]
  15. Back-Up: American-Britih Dictionary [home, info]
  16. back up: Phrasal Verb Page [home, info]
  17. back up: Free Dictionary [home, info]
  18. back up: Mnemonic Dictionary [home, info]
  19. back up: WordNet 1.7 Vocabulary Helper [home, info]
  20. back up: LookWAYup Translating Dictionary/Thesaurus [home, info]
  21. back-up, back up: Dictionary/thesaurus [home, info]

Art dictionaries Art (2 matching dictionaries)
  1. Back up: English-Chinese Dictionary of Graphic Communications (Big 5) [home, info]
  2. BACK-UP: Technical Glossary of Theatre Terms [home, info]

Business dictionaries Business (7 matching dictionaries)
  1. Back up: MoneyGlossary.com [home, info]
  2. back up: INVESTORWORDS [home, info]
  3. Back-up: bizterms.net [home, info]
  4. Back up: Bloomberg Financial Glossary [home, info]
  5. back-up, back up: Legal dictionary [home, info]
  6. Back Up: Financial dictionary [home, info]
  7. Back up: Accounting, Business Studies and Economics Dictionary [home, info]

Computing dictionaries Computing (2 matching dictionaries)
  1. back up: CCI Computer [home, info]
  2. Back-up, back up: Encyclopedia [home, info]

Medicine dictionaries Medicine (1 matching dictionary)
  1. Back-up, back up: Medical dictionary [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. back-up: Urban Dictionary [home, info]

Sports dictionaries Sports (1 matching dictionary)
  1. Back up: Sports Definitions [home, info]

Tech dictionaries Tech (2 matching dictionaries)
  1. Back up: AUTOMOTIVE TERMS [home, info]
  2. back up: Schlumberger Oilfield Glossary [home, info]

(Note: See back_ups for more definitions.)

Quick definitions from WordNet (back up)

verb:  make a copy of (a computer file) especially for storage in another place as a security cop ("You'd better back up these files!")
verb:  move backwards from a certain position
verb:  establish as valid or genuine ("Can you back up your claims?")
verb:  give moral or psychological support, aid, or courage to
verb:  become or cause to become obstructed

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Phrases that include back up:   get back up, back up the truck, put someones back up, get someone's back up, gets back up, more...

Words similar to back up:   back, choke, clog, congest, foul, substantiate, support, more...

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