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We found 14 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 (8 matching dictionaries)

1. back-up: Collins English Dictionary [home, info]
2. Back-Up, Back-up, back-up: Wordnik [home, info]
3. back-up: Cambridge Advanced Learner's Dictionary [home, info]
4. back-up: Wiktionary [home, info]
5. Back-up: Wikipedia, the Free Encyclopedia [home, info]
6. back-up: Cambridge International Dictionary of Phrasal Verbs [home, info]
7. Back-Up: American-Britih Dictionary [home, info]
8. back-up: Dictionary/thesaurus [home, info]

Art (1 matching dictionary)

9. BACK-UP: Technical Glossary of Theatre Terms [home, info]

Business (2 matching dictionaries)

10. Back-up: bizterms.net [home, info]
11. back-up: Legal dictionary [home, info]

Computing (1 matching dictionary)

12. Back-up: Encyclopedia [home, info]

Medicine (1 matching dictionary)

13. Back-up: Medical dictionary [home, info]

Slang (1 matching dictionary)

14. back-up: Urban Dictionary [home, info]

Quick definitions from Wiktionary (back-up) ▸ adjective:  Alternative spelling of backup [Standby, reserve or extra.] ▸ noun:  Alternative spelling of backup [A reserve or substitute.] ▸ Words similar to back-up ▸ Usage examples for back-up ▸ Idioms related to back-up (New!) ▸ Popular adjectives describing back-up ▸ Popular nouns described by back-up ▸ Words that often appear near back-up ▸ Rhymes of back-up ▸ Invented words related to back-up