A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble.
Nationals new candidate for Auckland Central, anyone else spotting a red flag or two. #nzpol
The Lemkin Institute for Genocide Prevention has issued red flag warnings for genocide against trans people by the UK government. That's your very left-wing boys. Own it.
A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble. Compare with "green flag" (good sign) and "beige flag" (odd but neutral). "He doesn't tip waiters" has ended more relationships than any app algorithm.
red flag means A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble. It's mostly used in casual online conversation. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
Add your own interpretation of "red flag".
Head-to-head pages explaining the difference.
Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
See all Internet & Memes slang on Slangora.
Browse all slang words starting with R.
A positive trait or behavior indicating someone is emotionally healthy, thoughtful, or a good match. "He asked about my day before telling me about his" is the archetypal green flag — small but diagnostic. Compare with red flag (dealbreaker) and beige flag (oddly specific).
Partner's oddly specific quirk that's not a dealbreaker but definitely weird — alphabetizing spices, only using plain WhatsApp, refusing to eat the ends of bread.
It's always a red flag for callous unseriousness when all prescribing is regarded as overprescribing, when they can't and don't want to define a use case for appropriate prescribing.
"He doesn't tip waiters. Massive red flag."
red flag means A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble. It's mostly used in casual online conversation. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
"red flag" is slang. It means: A warning sign in dating or friendships — a behavior that suggests incompatibility or trouble. Register: casual. Use it in: casual conversation and online posts. Avoid in: formal writing and professional emails.
“Nationals new candidate for Auckland Central, anyone else spotting a red flag or two. #nzpol”
“The Lemkin Institute for Genocide Prevention has issued red flag warnings for genocide against trans people by the UK government. That's your very left-wing boys. Own it.”
“It's always a red flag for callous unseriousness when all prescribing is regarded as overprescribing, when they can't and don't want to define a use case for appropriate prescribing.”
“It is commonly called the "Five-star Red Flag" in China.”
“The Five-star Red Flag was adopted as the national flag of China upon the proclamation of the People's Republic of China on 1 October 1949.”
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A flag formerly used by a railway guard to warn the driver not to start the train.
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A cue, warning, or alert; a sign or signal that something is wrong.
A flag that is red, especially associated with leftist revolutionary ideologies.
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Something that will enrage a particular person; a red rag.
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