red flag
noun
the symbol or banner of a left-wing revolutionary party.
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red flag
1 Americannoun
-
the symbol or banner of a left-wing revolutionary party.
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a danger signal.
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something that provokes an angry or hostile reaction.
The talk about raising taxes was a red flag to many voters.
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Also called powder flag. Nautical. a red burgee, designating in the International Code of Signals the letter “B,” flown by itself to show that a vessel is carrying, loading, or discharging explosives or highly inflammable material.
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(initial capital letters) a war game the U.S. Air Force holds several times each year at Nellis Air Force Base, Nevada, to train personnel in air combat.
red-flag
2
American
[red-flag]
/ ˈrɛdˈflæg /
verb (used with object)
red-flagged,
red-flagging
-
to mark or draw attention to for a particular purpose.
The department has red-flagged the most urgent repair work to be done.
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to provoke the attention of; alert; arouse.
The animal's refusal to eat red-flagged the keeper that something was wrong.
adjective
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of or relating to a red flag.
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intended or serving to emphasize, warn, incite, or provoke.
red flag
1
British
noun
-
a symbol of socialism, communism, or revolution
-
a warning of danger or a signal to stop
Red Flag
2
British
noun
Etymology
Origin of red flag1
First recorded in 1770–80
Origin of red-flag2
First recorded in 1880–85
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
She said that as she spent so much time on a computer running her business, she was used to seeing scams, but this time "nothing sparked a red flag".
From BBC ● Sep. 18, 2026
One person had to wave a red flag while walking in front of the vehicle to warn horses and pedestrians.
From The Wall Street Journal ● Sep. 13, 2026
Sally, reluctant though she is, immediately connects with the tattooed professor, even if there is a red flag or two waving.
From Los Angeles Times ● Sep. 11, 2026
True, the latter is the ultimate red flag.
From Los Angeles Times ● Sep. 9, 2026
Whenever Stanton had a baby, a flag was raised outside her house—a red flag for a boy, white for a girl.
From "Votes for Women!" by Winifred Conkling
The data only needs to be aggregated; red-flag algorithms need to be programmed in.
From The Wall Street Journal ● Jun. 23, 2026
“We have a red-flag system here, where if there’s anything that gets really out of whack, they can immediately tag the milk, and it doesn’t go to anything but cheese,” McAfee told me.
From Salon ● Jun. 22, 2026
You are in big red-flag territory for this one.
From MarketWatch ● May 26, 2026
The elementary school relocates out of town during red-flag days.
From Los Angeles Times ● Nov. 24, 2025
She denounced it as a “hodgepodge of plagiarism pulled from here, a bit from there, the whole misinterpreted and sensationalized to give color to the red-flag word SPIES.”
From "The Woman All Spies Fear" by Amy Butler Greenfield
In recent years, the Air Force has looked for new ways to use the Reaper in combat, sending it to large-scale combat exercises, including Valiant Shield in the Pacific and Red Flag in Alaska.
From The Wall Street Journal ● Mar. 16, 2026
Although the winds are trending weaker, esp. for vlys & coasts, Red Flag Warnings have been extended through Thur 8PM.
From Los Angeles Times ● Jan. 21, 2025
He then got into his Chinese Hongqi, or "Red Flag," limousine and departed the airport into San Francisco, where demonstrations are expected both for and against his visit.
From Reuters ● Nov. 15, 2023
But the routine of singing the party's anthem, the Red Flag, to close their conference continues.
From BBC ● Oct. 11, 2023
“We are going to a place just west of Seventh Avenue, called the Red Flag Club.”
From The Crimson Tide A Novel by Robert W. (Robert William) Chambers
For instance, a corporate group of high-handicap golfers who haven’t played the course before can be red-flagged in advance.
From The Wall Street Journal ● Apr. 10, 2026
Mercedes duo Kimi Antonelli and George Russell completed the podium in a sprint that was red-flagged after Piastri and Alpine's Franco Colapinto' exited the 100km dash.
From Barron's ● Nov. 8, 2025
Living in a one-bedroom flat and pregnant, Ms Murray said her house was red-flagged due to the risk Newell posed to her and her unborn daughter.
From BBC ● Jun. 3, 2025
After several visits to her GP and dentist she was referred to her local hospital for an ultrasound and she was red-flagged as needing urgent care.
From BBC ● Mar. 4, 2025
“Again I swung my red-flagged brassey in front of the angry creature’s face, and what I had hoped for followed.”
From Mr. Munchausen Being a True Account of Some of the Recent Adventures beyond the Styx of the Late Hieronymus Carl Friedrich, Sometime Baron Munchausen of Bodenwerder by John Kendrick Bangs
“Passing judgments, applying labels, and red-flagging educational materials that might prompt uncomfortable but insightful discussions are activities that do not belong in our public schools.”
From Washington Post ● Nov. 10, 2019
From next season players will be tested every day for six minutes before training, with computers immediately red-flagging anyone at risk.
From The Guardian ● Apr. 7, 2013
But we make the caddie do the ordinary work of carrying, and teeing up, and red-flagging also, and he contrives in effect to be in two places at the same time.
From The Happy Golfer Being Some Experiences, Reflections, and a Few Deductions of a Wandering Golfer by Henry Leach
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
