red flag: meaning, definition, pronunciation and examples
HighInformal to Formal (context-dependent)
Quick answer
What does “red flag” mean?
A literal red-colored flag used as a warning signal (e.
Audio
Pronunciation
Definition
Meaning and Definition
A literal red-colored flag used as a warning signal (e.g., in motor racing, on beaches).
A sign or signal indicating a potential problem, danger, or reason for caution, especially regarding behavior, character, or a situation.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning or usage. Both use the term extensively in the metaphorical sense.
Connotations
Identical strong negative warning connotation in both varieties.
Frequency
Equally high frequency in both varieties, with a slight modern increase in American media discussing relationships and workplace culture.
Grammar
How to Use “red flag” in a Sentence
[Something] is/was a red flag[Someone] raised a red flag about [something][Verb] a red flagA red flag for [something]Vocabulary
Collocations
Examples
Examples of “red flag” in a Sentence
verb
British English
- The auditor red-flagged several transactions for further review.
- I must red-flag that proposal on ethical grounds.
American English
- The system automatically red-flags any login from an unfamiliar location.
- Her history was red-flagged during the background check.
adverb
British English
- (Not standard; no adverbial form in use.)
American English
- (Not standard; no adverbial form in use.)
adjective
British English
- He displayed several red-flag behaviours during the interview.
- We keep a list of red-flag indicators for fraud.
American English
- That's a major red-flag statement from a potential partner.
- The report highlighted red-flag conditions in the contract.
Usage
Meaning in Context
Business
Refers to indicators of financial risk, ethical breaches, or operational failures in due diligence.
Academic
Used in psychology, sociology, and medicine to denote warning signs of a condition or problematic behavior.
Everyday
Commonly used in discussions about relationships, dating, friendships, and online interactions.
Technical
In computing/IT, can refer to system alerts or flags in code review; in motorsport/aviation, the literal flag.
Vocabulary
Synonyms of “red flag”
Vocabulary
Antonyms of “red flag”
Watch out
Common Mistakes When Using “red flag”
- Using it as a verb incorrectly (e.g., 'He red-flagged' is less common; prefer 'He raised a red flag').
- Overusing for trivial issues, diluting its warning strength.
- Misspelling as one word 'redflag'.
FAQ
Frequently Asked Questions
Yes, in its modern metaphorical sense, it exclusively indicates a warning, problem, or danger.
Yes, especially in formal/business contexts (e.g., 'to red-flag an issue'), though 'raise a red flag' is more common in everyday speech.
A red flag is a warning sign that suggests a potential problem. A dealbreaker is a specific issue that makes you reject something entirely. Multiple red flags can lead to a dealbreaker.
Its literal use dates back centuries as a signal of danger (e.g., in railways, military). The metaphorical use became widespread in the 20th century.
A literal red-colored flag used as a warning signal (e.
Red flag is usually informal to formal (context-dependent) in register.
Red flag: in British English it is pronounced /ˌred ˈflæɡ/, and in American English it is pronounced /ˌrɛd ˈflæɡ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “A red flag to a bull (something that provokes anger)”
Learning
Memory Aids
Mnemonic
Think of a bullfighter's RED cape (flag) – it signals DANGER and makes you want to STOP.
Conceptual Metaphor
POTENTIAL PROBLEM IS A WARNING SIGNAL (COLOR RED).
Practice
Quiz
In a business context, what does 'red flag' most likely refer to?