We found 24 dictionaries that define the word cock up:

General (18 matching dictionaries)

1. cock-up: Merriam-Webster
2. cock-up: Oxford Learner's Dictionaries
3. cock-up: American Heritage Dictionary of the English Language
4. cock up: Vocabulary.com
5. cock-up: Wordnik
6. cock-up: Cambridge Advanced Learner's Dictionary
7. cock-up, cock up: Wiktionary
8. cock-up: Webster's New World College Dictionary, 4th Ed.
9. cock-up, cock up: Dictionary.com
10. Cock-up: Wikipedia, the Free Encyclopedia
11. cock up: Rhymezone
12. cock up: FreeDictionary.org
13. cock up: Mnemonic Dictionary
14. cock-up, cock up: TheFreeDictionary.com
15. Cock-up: World Wide Words
16. cock up: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)

17. cock up: Encyclopedia

Medicine (1 matching dictionary)

18. cock up: Medical dictionary

Miscellaneous (1 matching dictionary)

19. cock up: Idioms

Slang (3 matching dictionaries)

20. cock up: Green’s Dictionary of Slang
21. cock-up: English slang and colloquialisms used in the United Kingdom
22. cock up: Urban Dictionary

(Note: See cock_ups as well.)

Definitions from Wiktionary (cock up) ▸ verb:  (ambitransitive, chiefly UK, Commonwealth, Ireland, slang, mildly vulgar) To ruin (something) unintentionally; to fuck up, mess up, or screw up. Similar: prick up, prick, slip up, cup tie, bust up, splash out, rule out, wait on, miss out, see off, more... Types: fumble, bungle, screw up, bollocks up, ball up, bollix up, bollocks, more... Adjectives: screwed up, botched up, bungled, whoopsy, bad, beef, messed up, wrecked, fubar, hosed, ree ▸ Words similar to cock up ▸ Usage examples for cock up ▸ Idioms related to cock up ▸ Wikipedia articles (New!) ▸ Words that often appear near cock up ▸ Rhymes of cock up ▸ Invented words related to cock up