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
Body language expert says New Orleans terrorist exhibited 'red flags' before attack.
—
Fox News, 13 Jan. 2025
Deadly wildfires have left parts of Southern California devastated -- and the danger is not over, with more windy weather predicted and red flag warnings extended through Wednesday.
—Geoffrey Eisler, ABC News, 12 Jan. 2025
Though winds diminished slightly on Thursday, much of Los Angeles County remained under a red flag warning, with forecasters cautioning against critical fire weather through Friday night.
—Hannah Fry, Los Angeles Times, 10 Jan. 2025
Participating anglers must bring their own bright red flags, (1 foot in diameter or larger) to hang on fishing shanties, according to the DNR.
—Tanya Wildt, Detroit Free Press, 31 Dec. 2024
See all Example Sentences for red flag 
Fox News, 13 Jan. 2025
Deadly wildfires have left parts of Southern California devastated -- and the danger is not over, with more windy weather predicted and red flag warnings extended through Wednesday.
—Geoffrey Eisler, ABC News, 12 Jan. 2025
Though winds diminished slightly on Thursday, much of Los Angeles County remained under a red flag warning, with forecasters cautioning against critical fire weather through Friday night.
—Hannah Fry, Los Angeles Times, 10 Jan. 2025
Participating anglers must bring their own bright red flags, (1 foot in diameter or larger) to hang on fishing shanties, according to the DNR.
—Tanya Wildt, Detroit Free Press, 31 Dec. 2024
See all Example Sentences for red flag
Recent Examples of Synonyms for red flag
Noun
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Tran then ran a red light and fled home to Yonkers.—
Graham Rayman,
New York Daily News,
14 Jan. 2025
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The new Republican governor, George Voinovich, was a devout Catholic who went to Mass multiple times a week, an expression of a faith that was inherited from his Slovenian American mother and deepened by the loss of his 9-year-old daughter, who was struck by a van that ran a red light.—
Alec MacGillis,
ProPublica,
13 Jan. 2025
Noun
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The Clay Fire in Riverside County, near Los Angeles, has ignited on Tuesday evening, growing to nearly 40 acres and prompting evacuation warnings.—
Kristen Waggoner,
Newsweek,
22 Jan. 2025
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The first violation would result in a warning provided the motorist completes an online safety and awareness course.—
Thomas Wheatley,
Axios,
21 Jan. 2025
Noun
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This might be a sign of experiencing imposter syndrome and having a false concern of self-doubt in yourself.—
Lance Eliot,
Forbes,
23 Jan. 2025
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Bronx Councilwoman Diana Ayala, who chairs the City Council’s General Welfare Committee, said HEAP already running out of money is a sign lawmakers should consider increasing the program’s funding.—
Chris Sommerfeldt,
New York Daily News,
23 Jan. 2025
Thesaurus Entries Near red flag
Cite this Entry
“Red flag.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20flag. Accessed 26 Jan. 2025.
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