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'raise a red flag' is a correct and usable phrase in written English.
It can be used to refer to a warning sign that something is wrong or suspicious. For example: "The company's financial reports raised a red flag and caused some investors to sell their stock."
Exact(56)
"It can raise a red flag," he said.
"Most said they would walk away or raise a red flag," she said.
"They didn't raise a red flag," said Allan J. Fromberg, a spokesman for the agency.
There are no data that should raise a red flag for contemporary clerical wives.
The new mystery is why it took this long for anyone to raise a red flag.
Individually, each of these is serious enough to raise a red flag.
"Leaving off the date might raise a red flag, but usually it doesn't," Mr. Neece said.
"At very least it will raise a red flag," he said.
A shift in an author's e-mail style, from breezy to unusually formal, can raise a red flag about illegal activity.
"Focusing on the salary can raise a red flag with potential employers that you are only there for the money and not for any deeper reasons," he says.
We all want to keep children safe, and many behaviors should raise a red flag about a person's ability to parent competently.
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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