fuck up
Very HighVulgar / Taboo / Slang
Definition
Meaning
To make a serious error or mistake; to ruin, damage, or spoil something through incompetence or failure.
Can function as a phrasal verb meaning to fail disastrously, or as a noun to refer to the disastrous mistake itself. Also used to describe a person who chronically fails or is incompetent.
Linguistics
Semantic Notes
Extremely strong and offensive term. Its core semantic field revolves around catastrophic failure, often with a strong sense of personal blame. Can be transitive (fuck something up) or intransitive (to fuck up). As a noun, often written as 'fuck-up'.
Dialectal Variation
British vs American Usage
Differences
More common in American English, but fully understood and used in British English. In UK, 'cock up' is a less offensive, more established synonym. The verb-particle structure is identical in both varieties.
Connotations
Equally strong and vulgar in both varieties, though its perceived shock value may be slightly higher in more conservative British contexts.
Frequency
More frequent in American media and casual speech. In British English, the frequency might be marginally lower in some demographics, with 'mess up', 'screw up', or 'cock up' being alternatives.
Vocabulary
Collocations
Grammar
Valency Patterns
SVO (transitive): He fucked up the presentation.SV (intransitive): I really fucked up.SV + Prepositional Phrase: They fucked up on the delivery date.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “fuck up big time”
- “a complete fuck-up”
- “don't fuck it up (DFIU)”
Usage
Context Usage
Business
Highly inappropriate in formal business settings. May be used in extremely casual, closed-door contexts among peers, but carries high risk.
Academic
Not used in academic writing or formal speech.
Everyday
Common in very informal speech among friends, but considered deeply offensive by many. Usage is context and relationship-dependent.
Technical
Not used in technical documentation. May appear in informal bug reports or post-mortems in some tech cultures.
Examples
By Part of Speech
verb
British English
- Don't fuck up the booking this time.
- He's going to fuck up if he doesn't read the manual.
- I've really fucked up my ankle.
American English
- You'll fuck up the computer if you do that.
- She fucked up by missing the deadline.
- They totally fucked up the contract negotiations.
adjective
British English
- He's a bit fucked up after that experience. (meaning distressed)
- That's a fucked-up situation. (meaning badly wrong)
American English
- His sleep schedule is all fucked up.
- That is the most fucked-up idea I've ever heard.
Examples
By CEFR Level
- I'm sorry, I messed up the order. (Using synonym, not the target word at this level)
- Be careful not to make a serious mistake with the client's data.
- He made a huge error in the calculations.
- If you deviate from the protocol, you risk compromising the entire experiment.
- One miscalculation was all it took to derail the project.
Learning
Memory Aids
Mnemonic
Imagine someone trying to assemble furniture from IKEA incorrectly. The final result is wobbly and broken. The frustrated person shouts, "I really FUCKED UP this bookshelf!" The strong 'F' sound matches the force of the failure.
Conceptual Metaphor
FAILURE IS A CATASTROPHIC ACT OF DESECRATION / RUINING SOMETHING IS VIOLATING IT.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Never translate literally as "трахать вверх". This is nonsense.
- The closest single-word verb is "облажаться" or "провалить".
- The noun "fuck-up" is close to "косяк", "провал", or "жесть" (slang).
- Avoid using in contexts where you would use the milder "ошибиться" (to make a mistake).
Common Mistakes
- Using it in formal or polite company.
- Misspelling as 'fuckup' (verb) instead of 'fuck up'. The noun is often hyphenated: 'a fuck-up'.
- Incorrect transitivity: *'I fucked up it.' should be 'I fucked it up.'
Practice
Quiz
In which of the following contexts would 'fuck up' be LEAST appropriate?
FAQ
Frequently Asked Questions
Almost never. It is considered vulgar slang and is highly unprofessional in emails, reports, or formal documents. It may appear in very specific, edgy creative industries or in quoted speech.
Both mean to make a serious mistake. 'Fuck up' is significantly stronger, more vulgar, and carries more emotional weight (anger, frustration, blame). 'Screw up' is still informal but more widely acceptable in casual conversation.
Yes. As a noun, it's often hyphenated ('a fuck-up') and refers to the mistake itself or a person who makes mistakes (e.g., 'He's a total fuck-up').
The past tense and past participle are both 'fucked up'. Example: 'Yesterday I fucked up the presentation.' / 'I have fucked up too many times.'