noun
[ U , sing. ] a situation in which you are prepared for sth dangerous to happen; a warning of this :
Following the bomb blast, local hospitals have been put on red alert .
noun
[ U , sing. ] a situation in which you are prepared for sth dangerous to happen; a warning of this :
Following the bomb blast, local hospitals have been put on red alert .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005