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The phrase "a red flag for" is correct and usable in written English.
It is typically used to indicate a warning sign or indication of a potential problem or issue.
Example: "The sudden drop in sales was a red flag for the management team, prompting them to investigate further."
Alternatives: "a warning sign for" or "a cause for concern for".
Exact(60)
"I don't think that's a red flag for the Fed.
That was a red flag for F.T.C. enforcers.
But something about Ms. Victorio's case raised a red flag for the police.
Associating himself with that organization should be a red flag for all American voters.
There are no data that should raise a red flag for contemporary clerical wives.
Once it's marked on someone's legal record, it's a red flag for employers.
Q: So that would definitely raise a red flag for Comey.
This, they said, was a red flag for Mr. Putin, ahead of parliamentary elections next month.
Pictures of or references to excessive drinking or recreational drug use are definitely a red flag for many employers.
That should raise a red flag for companies, which set CEO pay and must justify those numbers.
Judge Samuel Alito is a red flag for liberals and red meat for Bush's socially conservative base.
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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