mess up: meaning, definition, pronunciation and examples
C1Informal, Conversational
Quick answer
What does “mess up” mean?
To make a mistake or handle something poorly, resulting in failure, disorder, or damage.
Audio
Pronunciation
Definition
Meaning and Definition
To make a mistake or handle something poorly, resulting in failure, disorder, or damage.
To cause physical or emotional disarray; to spoil, ruin, or bungle a task, plan, or situation. Can refer to causing a physical mess, making an error, or negatively affecting someone emotionally.
Dialectal Variation
British vs American Usage
Differences
Both varieties use it extensively. No significant structural differences. Slightly more common in American English as a casual synonym for 'make a mistake'.
Connotations
Conveys a sense of carelessness, incompetence, or accident. Can be harsh ('You really messed up!') or lighthearted/sympathetic ('Don't worry, everyone messes up sometimes').
Frequency
Very high frequency in informal spoken language in both regions. Appears in informal writing. Rare in formal contexts.
Grammar
How to Use “mess up” in a Sentence
Transitive: mess up [something]Intransitive: [someone] messes upReflexive: mess yourself upWith preposition: mess up on [something] (e.g., 'I messed up on the date')Vocabulary
Collocations
Examples
Examples of “mess up” in a Sentence
verb
British English
- Don't mess up the filing system, it's all in order.
- I'm afraid I've rather messed up the travel bookings.
American English
- He totally messed up his chances with that comment.
- Don't mess up your room right after I cleaned it.
adverb
British English
- (Not standard. 'Messed up' is not used as an adverb.)
American English
- (Not standard. 'Messed up' is not used as an adverb.)
adjective
British English
- The whole situation is a bit messed up, to be honest.
- He's feeling really messed up after the argument.
American English
- That's a messed-up way to treat someone.
- Her sleep schedule is all messed up.
Usage
Meaning in Context
Business
Used informally to mean a failed project or error (e.g., 'The supplier messed up the delivery'). Avoid in formal reports.
Academic
Rarely used. Replaced by formal terms like 'compromise the experiment', 'introduce an error', 'disrupt'.
Everyday
Extremely common for mistakes, disorder, and minor failures (e.g., 'I messed up the cooking', 'The kids messed up the living room').
Technical
Not used in formal technical writing. May appear in informal developer chat to mean 'corrupt code/data'.
Watch out
Common Mistakes When Using “mess up”
- Incorrect: 'I messed up my exam.' (Better: 'I messed up ON my exam' or 'I messed up the exam question.')
- Incorrect separable usage: 'I messed carefully up the instructions.' (Adverb cannot split the verb-particle pair this way.)
FAQ
Frequently Asked Questions
It is strongly informal. Use synonyms like 'make an error', 'compromise', or 'disrupt' in formal writing.
Yes. 'I messed up' is a common intransitive use meaning 'I made a mistake'.
'Mess up' means to ruin or make a mistake. 'Mess with' means to interfere with, tease, or provoke someone (e.g., 'Don't mess with him').
Yes, informally. 'The missing file was a real mess-up' means 'a serious mistake or chaotic situation'.
To make a mistake or handle something poorly, resulting in failure, disorder, or damage.
Mess up: in British English it is pronounced /ˈmes ʌp/, and in American English it is pronounced /ˈmɛs ˌəp/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “Mess up big time”
- “Mess up someone's head (to confuse or upset emotionally)”
- “Mess up the works”
Learning
Memory Aids
Mnemonic
Imagine a child with a bowl of spaghetti (a MESS) who lifts it UP and drops it, ruining everything. MESS + UP = ruin.
Conceptual Metaphor
ERROR IS DIRTYING / CREATING DISORDER. A clean, orderly state represents success; a messy, disordered state represents failure.
Practice
Quiz
In which sentence is 'mess up' used CORRECTLY?