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Discover LudwigThe phrase "a red flag for security" is correct and usable in written English.
It can be used to indicate a warning sign or indication of potential security issues or risks.
Example: "The sudden increase in login attempts from unfamiliar IP addresses is a red flag for security that we need to address immediately."
Alternatives: "a warning sign for security" or "a cause for concern regarding security".
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Connections among nodes in a transnational network represent potential infiltration points, and travel to and from Pakistan is a particular red flag for security services.
That was a red flag for F.T.C. enforcers.
Judge Samuel Alito is a red flag for liberals and red meat for Bush's socially conservative base.
That's a red flag for investors.
If so, that's a red flag for me.
All that should have been a red flag for investors.
Such underperformance was a red flag for us.
Stale prices are "considered a red flag for a flawed valuation process," Frenkel says.
That raises a red flag for me.
"It drew a red flag for me," Trout said.
It's also a red flag for ongoing domestic violence.
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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