Meaning of “red alert” in the English Dictionary

british dictionary

"red alert" in British English

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red alertnoun [ C ]

uk /ˌred əˈlɜːt/ us /ˌred əˈlɝːt/

(the state of being ready to deal with) a sudden dangerous situation:

The army was on red alert against the possibility of an attack.

(Definition of “red alert” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)