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"on red alert" is a correct and usable phrase in written English.
You can use it to express a heightened level of concern and vigilance. For example: With the recent increase in Covid-19 cases, the government is on red alert and has implemented stricter measures.
Exact(59)
She was "on red alert," sure that something bad would happen at any second.
"The airport is on red alert".
It's dark and I'm on red alert.
Bookmakers are now constantly on red alert.
"Attention all drivers, we're on red alert, we're on red alert".
"But I have put everybody on red alert".
Stokes relished the responsibility, as did fielders on red alert.
Police were on "red alert" for possible clashes between foes and friends of the president.
But the country remains in a precarious position, and foreigners are on red alert.
Affluent Republicans – the donor and policy base of the conservative movement — are on red alert.
The counter-argument is that forthcoming opponents have been placed on red alert.
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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