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
However, the vaginal swab is only meant to be used for women who have abnormal vaginal bleeding as a symptom, the most common red flag for endometrial cancer, said PinkDx co-founder and CEO Bonnie Anderson.
—
Dr. Chidimma J. Acholonu, ABC News, 3 Apr. 2026
When double red flags are flying, the Gulf is closed to the public.
—Emily McLeod, CBS News, 2 Apr. 2026
The biggest red flags linked to colorectal cancer include ongoing bleeding, persistent anemia and changes in bowel habits, according to the doctor.
—Melissa Rudy, FOXNews.com, 1 Apr. 2026
Whereas, someone who is on the outside can see what the red flags are.
—Glamour, 1 Apr. 2026
See All Example Sentences for red flag
Dr. Chidimma J. Acholonu, ABC News, 3 Apr. 2026
When double red flags are flying, the Gulf is closed to the public.
—Emily McLeod, CBS News, 2 Apr. 2026
The biggest red flags linked to colorectal cancer include ongoing bleeding, persistent anemia and changes in bowel habits, according to the doctor.
—Melissa Rudy, FOXNews.com, 1 Apr. 2026
Whereas, someone who is on the outside can see what the red flags are.
—Glamour, 1 Apr. 2026
See All Example Sentences for red flag
Recent Examples of Synonyms for red flag
Noun
-
Strong winds are occurring but are not so strong as to warrant a High wind warning.—
CA Weather Bot,
Sacbee.com,
7 Apr. 2026
-
Boston Red Sox first baseman Willson Contreras had a warning for the Milwaukee Brewers after he was hit on the hand by a pitch Monday night from right-hander Brandon Woodruff.—
ABC News,
ABC News,
7 Apr. 2026
Noun
-
Just getting to this point, where competing in meaningful games on national television is the norm, is a sign of the culture shift within the Charlotte Hornets.—
Roderick Boone,
Charlotte Observer,
8 Apr. 2026
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As the temperamental Moon enters your sign, you’re bolstered to stand up and state your needs without apology.—
Tarot.com,
New York Daily News,
8 Apr. 2026
Cite this Entry
“Red flag.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20flag. Accessed 10 Apr. 2026.
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