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We found 32 dictionaries with English definitions that include the word break up:
Click on the first link on a line below to go directly to a page where "break up" is defined.

General (24 matching dictionaries)

1. break up: Merriam-Webster.com [home, info]
2. break up: Oxford Dictionaries [home, info]
3. break-up, break-up, break up: Collins English Dictionary [home, info]
4. break up: Vocabulary.com [home, info]
5. break up: Macmillan Dictionary [home, info]
6. Break-Up, Break-up, break-up: Wordnik [home, info]
7. break-up, break (sth) up, break up: Cambridge Advanced Learner's Dictionary [home, info]
8. break up: Wiktionary [home, info]
9. Break-up, break up: Dictionary.com [home, info]
10. break-up, break up: UltraLingua English Dictionary [home, info]
11. Break Up (Mario song), Break Up (album), Break Up (song), Break Up, Break-up, Break up, The Break_Up (Glee), The Break-Up, The Break Up, The Break-up: Wikipedia, the Free Encyclopedia [home, info]
12. break-up: Cambridge International Dictionary of Phrasal Verbs [home, info]
13. Break-up: Online Plain Text English Dictionary [home, info]
14. break-up: Webster's Revised Unabridged, 1913 Edition [home, info]
15. break up: Rhymezone [home, info]
16. break-up, break up: AllWords.com Multi-Lingual Dictionary [home, info]
17. break up: Phrasal Verb Page [home, info]
18. break-up, break up: Free Dictionary [home, info]
19. break up: Mnemonic Dictionary [home, info]
20. break up: WordNet 1.7 Vocabulary Helper [home, info]
21. break up: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. break-up, break up: Dictionary/thesaurus [home, info]

Business (3 matching dictionaries)

23. Break Up: MoneyGlossary.com [home, info]
24. break up: Legal dictionary [home, info]
25. break up: Financial dictionary [home, info]

Computing (1 matching dictionary)

26. break up: Encyclopedia [home, info]

Medicine (1 matching dictionary)

27. break up: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

28. break up: Idioms [home, info]

Slang (1 matching dictionary)

29. the break up: Urban Dictionary [home, info]

Tech (1 matching dictionary)

30. Break up: AUTOMOTIVE TERMS [home, info]

Quick definitions from WordNet (break up) ▸ verb:  cause to separate ("Break up kidney stones") ▸ verb:  break or cause to break into pieces ▸ verb:  laugh unrestrainedly ▸ verb:  come apart ▸ verb:  come to an end ▸ verb:  bring the association of to an end or cause to break up ▸ verb:  release ice ▸ verb:  attack with or as if with a pickaxe of ice or rocky ground, for example ▸ verb:  set or keep apart ▸ verb:  break violently or noisily; smash; ▸ verb:  destroy the completeness of a set of related items ▸ verb:  separate (substances) into constituent elements or parts ▸ verb:  close at the end of a session ▸ verb:  cause to go into a solution ▸ verb:  make a break in ▸ verb:  take apart into its constituent pieces ▸ verb:  suffer a nervous breakdown ▸ verb:  to cause to separate and go in different directions ▸ verb:  discontinue an association or relation; go different ways ▸ Words similar to break up ▸ Words that often appear near break up ▸ Rhymes of break up ▸ Invented words related to break up