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

General (20 matching dictionaries)

1. muck up: Merriam-Webster.com [home, info]
2. muck up: Oxford Dictionaries [home, info]
3. muck-up, muck-up, muck up: Collins English Dictionary [home, info]
4. muck up: Vocabulary.com [home, info]
5. muck up: Macmillan Dictionary [home, info]
6. muck-up: Wordnik [home, info]
7. muck-up: Cambridge Advanced Learner's Dictionary [home, info]
8. muck-up, muck up: Wiktionary [home, info]
9. muck-up: Infoplease Dictionary [home, info]
10. muck-up, muck up: Dictionary.com [home, info]
11. muck-up: Cambridge International Dictionary of Phrasal Verbs [home, info]
12. muck up: Rhymezone [home, info]
13. muck up: AllWords.com Multi-Lingual Dictionary [home, info]
14. muck up: Free Dictionary [home, info]
15. muck up: Mnemonic Dictionary [home, info]
16. muck up: WordNet 1.7 Vocabulary Helper [home, info]
17. muck up: LookWAYup Translating Dictionary/Thesaurus [home, info]
18. muck-up, muck up: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

19. muck up: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

20. muck up: Idioms [home, info]

Slang (2 matching dictionaries)

21. muck-up, muck (something) up: English slang and colloquialisms used in the United Kingdom [home, info]
22. muck up: Urban Dictionary [home, info]

Quick definitions from WordNet (muck up) ▸ verb:  make a mess of, destroy or ruin ▸ verb:  soil with mud, muck, or mire ▸ Words similar to muck up ▸ Usage examples for muck up ▸ Words that often appear near muck up ▸ Rhymes of muck up ▸ Invented words related to muck up