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We found 24 dictionaries with English definitions that include the word fuck up:
Click on the first link on a line below to go directly to a page where "fuck up" is defined.

General (20 matching dictionaries)

1. fuck up: Merriam-Webster.com [home, info]
2. fuck-up: Oxford Learner's Dictionaries [home, info]
3. fuck-up, fuck up: Collins English Dictionary [home, info]
4. fuck up: Vocabulary.com [home, info]
5. fuck-up, fuck up: Macmillan Dictionary [home, info]
6. fuck-up, fuck (sth) up: Cambridge Advanced Learner's Dictionary [home, info]
7. fuck-up, fuck up: Wiktionary [home, info]
8. fuck up: Dictionary.com [home, info]
9. fuck-up, fuck up: UltraLingua English Dictionary [home, info]
10. fuck-up: Cambridge Dictionary of American English [home, info]
11. Fuck Up: Wikipedia, the Free Encyclopedia [home, info]
12. fuck-up: Cambridge International Dictionary of Phrasal Verbs [home, info]
13. fuck up: Rhymezone [home, info]
14. fuck up: Free Dictionary [home, info]
15. fuck up: Mnemonic Dictionary [home, info]
16. fuck up: WordNet 1.7 Vocabulary Helper [home, info]
17. fuck up: LookWAYup Translating Dictionary/Thesaurus [home, info]
18. fuck-up, fuck up: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

19. fuck up: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

20. fuck up: Idioms [home, info]

Slang (2 matching dictionaries)

21. fuck up: English slang and colloquialisms used in the United Kingdom [home, info]
22. the fuck up: Urban Dictionary [home, info]

(Note: See fuck_ups for more definitions.)

Quick definitions from WordNet (fuck up) ▸ verb:  make a mess of, destroy or ruin ▸ Also see fuck_ups ▸ Words similar to fuck up ▸ Usage examples for fuck up ▸ Idioms related to fuck up (New!) ▸ Words that often appear near fuck up ▸ Rhymes of fuck up ▸ Invented words related to fuck up