as in red light
something that tells of approaching danger or risk
the résumé she accidentally left on the office printer was a red flag that she was planning to quit
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Recent Examples of red flag
If a company says your package is stuck in customs or asks for additional payment due to tariffs, that’s a major red flag.
—
Betty Lin-Fisher, USA Today, 7 June 2025
Everything the Phillies measure with their pitchers to catch potential red flags has not indicated any physical issues.
—Matt Gelb, New York Times, 6 June 2025
This suggests that most of the buyers are foreigners, certainly a red flag to those familiar with the crypto and financial world.
—Tom Jurkowsky, Baltimore Sun, 5 June 2025
This is a massive red flag when considering the legitimacy of any website like this.
—Jeremy Hanna, MSNBC Newsweek, 4 June 2025
See All Example Sentences for red flag
Betty Lin-Fisher, USA Today, 7 June 2025
Everything the Phillies measure with their pitchers to catch potential red flags has not indicated any physical issues.
—Matt Gelb, New York Times, 6 June 2025
This suggests that most of the buyers are foreigners, certainly a red flag to those familiar with the crypto and financial world.
—Tom Jurkowsky, Baltimore Sun, 5 June 2025
This is a massive red flag when considering the legitimacy of any website like this.
—Jeremy Hanna, MSNBC Newsweek, 4 June 2025
See All Example Sentences for red flag
Recent Examples of Synonyms for red flag
Noun
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There's two options with the switch: the first will turn on a red light, to tell you the thermal brush is heating up.—
Nena Farrell,
Wired News,
20 June 2025
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Lamping allegedly ran a red light at the intersection of the two roads, and the Chevrolet pickup struck the driver’s side of the Toyota at highway speed, the highway patrol said.—
Kendrick Calfee,
Kansas City Star,
18 June 2025
Noun
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The warning was issued Friday at 4:32 p.m., and the last update regarding this incident was released on Friday at 4:34 p.m.—
Kansas City Star,
Kansas City Star,
14 June 2025
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The director of the Los Angeles Police Department's union slammed city and state leadership while issuing a stark warning to would-be anti-Immigration and Customs Enforcement rioters.—
Peter D'Abrosca,
FOXNews.com,
14 June 2025
Noun
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Both pursuits satisfy our craving for signs of humanity in a being thought to be divine.—
S. C. Cornell,
New Yorker,
16 June 2025
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According to celebrities, there are already signs of the silhouettes will reign supreme.—
Christian Allaire,
Vogue,
16 June 2025
Cite this Entry
“Red flag.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20flag. Accessed 24 Jun. 2025.
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