green flag

What it means

A green flag is a behavior or quality that looks like a good sign: someone who respects your boundaries, owns a mistake, or stays calm in an argument. Tinder Australia's Dating Dictionary, from March 2023, defines it as "a positive sign that indicates a good match." Merriam-Webster's slang entry defines it as the opposite of a red flag, a warning sign. Said to someone, "you're a green flag" is direct praise. Said about someone, as in "he's such a green flag," it is an evaluation passed along to a friend, the way you would report back after a first date. The relationship sources name a similar set of behaviors. The Gottman Institute's Elizabeth Earnshaw describes gentle communication, taking responsibility, self-soothing and respectful conflict management. Loveisrespect lists communication, respect, trust, equality, boundaries and consent. Tyler Jamison's list of ten in Psychology Today includes trust, respecting boundaries, responsibility, positive regard and collaboration, and he calls it a guidepost and says it is not a quiz to put a partner through. Standards differ from person to person, so read these as examples. One kind act is a good day, while kindness that repeats under stress is a pattern, and the label fits a pattern better. The phrase also gets used about friends, coworkers and bosses, and some people use it ironically for basic decency, with the approving meaning still underneath. In racing, a green flag starts or restarts a race, and at a beach it can mean safe swimming. If the conversation mentions a track or a beach, that literal meaning is the one in play. If it mentions a date, a partner, boundaries or red flags, it is the relationship sense. At work or school, "positive sign" or a specific line like "respects boundaries" says the same thing in a more formal register.

See the quick definition in the green flag dictionary entry.

How to use it

• “he said "that was my mistake" and didn't make it weird. green flag”

  Taking responsibility, a trait the Gottman Institute and Psychology Today both name.

• “she asked if i wanted to go further and said ok when i said not yet. green flag”

  Respecting boundaries and consent, which loveisrespect and Psychology Today list.

• “we disagreed and he stayed calm and talked it through. total green flag”

  Self-soothing and respectful conflict management in the Gottman Institute's terms.

• “He absolutely adores dogs - the green flags are adding up!”

  Tinder Australia's own example sentence, on a first-date impression.

Where it came from

No single person is documented as the source of the relationship sense. It grew by analogy with "red flag," which the Oxford English Dictionary attests as early as 1585, according to Psychology Today's Roger Kreuz. The earliest relationship use Kreuz found is a July 2013 post in Reddit's r/AskWomen titled "Ladies, What Are Your 'Green Flags'?" It is the earliest documented example and carries no claim of a first use anywhere, and Kreuz reads the quotation marks around "Green Flags" as a sign that the phrase was still unfamiliar.

Kreuz dates Psychology Today's own first relationship use of the phrase to April 2019, and says the site did not use it commonly until about 2023. The Gottman Institute published its red flag and green flag article in August 2021. Tinder Australia defined the phrase in its March 2023 Dating Dictionary, and Time's June 2023 report on beige flags set them between green flags and red flags. The spread was gradual, and no single song, show, streamer or app is documented as the cause.

Where it's popular

General English-language internet use: dating apps, TikTok and Instagram captions, Reddit threads, comment sections and group chats. It is not tied to a region.

The British Council's 2025 data on English words and expressions reports broad awareness of the pair "red flag" and "green flag" across age groups, with Millennials using it most and strong use among Gen Z and older adults.

How it caught on

1. 1585The Oxford English Dictionary attests "red flag," the expression green flag was built beside, as early as this year, according to Roger Kreuz.
2. July 2013A post in Reddit's r/AskWomen is titled "Ladies, What Are Your 'Green Flags'?", the earliest relationship use Kreuz identified.
3. April 2019Psychology Today uses "green flag" in an article about relationships for the first time, per Kreuz.
4. August 12, 2021The Gottman Institute publishes "Red Flag/Green Flag: What to Look for When You're Dating."
5. March 2023Tinder Australia's Dating Dictionary defines green flag as "a positive sign that indicates a good match."
6. June 9, 2023Time publishes its report on beige flags, which places them between green flags and red flags.
7. January 12, 2024Psychology Today publishes Tyler Jamison's "10 Green Flags for Great Relationships."
8. November 2026A TikTok from @sunaeisa tagged #greenflag passes 62,000 views within days of posting.

Test yourself

Related slang

More word guides

• gyat
• game
• beige flag
• the ick
• main squeeze
• fboi

Questions people ask

• https://www.psychologytoday.com/za/blog/small-talk-and-big-questions/202507/the-colorful-terms-we-use-to-describe-behavioral-cues
• https://www.gottman.com/blog/red-flag-green-flag-what-to-look-for-when-youre-dating/
• https://www.loveisrespect.org/resources/green-flags-in-relationships/
• https://www.psychologytoday.com/us/blog/assembly-required/202401/10-green-flags-for-relationships
• https://filecache.mediaroom.com/mr5mr_tinder_au/179378/download/Dating%20Dictionary%20March%202023.pdf
• https://www.merriam-webster.com/slang/green-flag
• https://time.com/6286130/tiktok-beige-flags/
• https://www.britishcouncil.de/sites/default/files/wed_ebook.pdf
• https://www.tiktok.com/@sunaeisa/video/7705475122164927764