English

Definition of red alert noun from the Oxford Advanced Learner's Dictionary

 

red alert

 noun
noun
BrE
 
; NAmE
 
[uncountable, singular]
 
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a situation in which you are prepared for something dangerous to happen; a warning of this Following the bomb blast, local hospitals have been put on red alert. The water authority has issued a red alert until the cause of the pollution has been removed.
See the Oxford Advanced American Dictionary entry: red alert