muck up: meaning, definition, pronunciation and examples
High (informal)Informal
Quick answer
What does “muck up” mean?
To make a mess of something.
Audio
Pronunciation
Definition
Meaning and Definition
To make a mess of something; to spoil, ruin, or perform poorly.
To cause confusion or disorder; to behave irresponsibly, especially in a way that damages one's own or others' plans or opportunities.
Dialectal Variation
British vs American Usage
Differences
More common in British and Australian English; American English uses 'mess up', 'screw up', or 'foul up' more frequently. The noun 'muck' (dirt) is less common in AmE.
Connotations
In BrE, it can sound colloquial but not overly harsh. In AmE, it might be perceived as a Britishism or sound slightly quaint.
Frequency
High frequency in BrE informal speech; medium-low in AmE, where synonyms are preferred.
Grammar
How to Use “muck up” in a Sentence
muck up + noun phrase (transitive)muck up + reflexive pronounVocabulary
Collocations
Examples
Examples of “muck up” in a Sentence
verb
British English
- I hope I don't muck up my driving test.
- The bad weather has mucked up our picnic plans.
- He's always mucking things up.
American English
- I totally mucked up the presentation. (used knowingly as BrE)
- Don't muck up this opportunity.
- The software update mucked up my settings.
adverb
British English
- (Not used as an adverb.)
American English
- (Not used as an adverb.)
adjective
British English
- (Not typically used as adjective. Past participle 'mucked-up' is rare.)
American English
- (Not typically used as adjective.)
Usage
Meaning in Context
Business
Avoid in formal reports; used informally to mean 'cause a project failure'.
Academic
Highly unlikely in formal writing; possible in casual student conversation about exams.
Everyday
Very common in informal BrE conversation for mistakes and failures.
Technical
Not used.
Watch out
Common Mistakes When Using “muck up”
- Incorrect: 'I mucked up the room' (if you mean you cleaned it).
- Incorrect: 'Don't muck up!' (without an object – needs 'it').
FAQ
Frequently Asked Questions
No, it is informal but not swearing. It is milder than 'screw up' or 'fuck up'.
No, that is a common confusion. 'Muck out' means to clean (e.g., a stable). 'Muck up' only means to spoil or dirty.
Yes, it is a separable phrasal verb. 'Don't muck up the plan' and 'Don't muck the plan up' are both correct, though the first is more common.
They are largely synonymous. 'Muck up' is more British, 'mess up' is universal but more American. 'Mess up' can also mean to make a place untidy more readily than 'muck up'.
To make a mess of something.
Muck up is usually informal in register.
Muck up: in British English it is pronounced /ˈmʌk ʌp/, and in American English it is pronounced /ˈmʌk ʌp/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “muck up the works”
- “muck it up”
Learning
Memory Aids
Mnemonic
Imagine a farmer stepping in MUCK (manure) and then UP-setting a bucket, ruining his clean boots – he MUCKED UP.
Conceptual Metaphor
FAILURE IS MAKING SOMETHING DIRTY / DISORDER IS DIRT
Practice
Quiz
In which context is 'muck up' LEAST appropriate?