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Discover LudwigThe phrase "a warning flag" is correct and usable in written English.
It can be used to indicate a sign or signal that something may be wrong or requires attention.
Example: "The sudden drop in sales was a warning flag that we needed to reassess our marketing strategy."
Alternatives: "a red flag" or "a caution sign".
Exact(38)
"It's certainly throwing up a warning flag," Dr. Biro said.
But it was at least a warning flag.
"Labour's conference decision should raise a warning flag for potential investors," Hayes said.
"It should have been enough to raise a warning flag before the election".
Whatever the ultimate verdict, it is hard to fault regulators for raising a warning flag.
The gunshots, combined with a shooting in the park earlier in the month, sent up a warning flag.
Similar(21)
Worse, a warning flagged in the catalog by a symbol and read aloud by the auctioneer Jussi Pylkkänen before opening the proceedings was enough to dampen the enthusiasm of potential buyers.
At some point, trains were required to send a man ahead on horseback waving a red warning flag, at a pace of six miles per hour.
If there is a mismatch, there will be a small warning flag with the movie's frame rate in yellow.
She recalled that when Savater, the co-founder of her party, was asked about political protest he cited a scene in "Modern Times," in which Chaplin sees a truck go by carrying steel beams, with a red warning flag on the back.
"It's like a hurricane warning flag.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com