red alert
noun/ˌred əˈlɜːt/
/ˌred əˈlɜːrt/
[uncountable, singular]- 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.
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red alert