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yellow alert
noun
- (in military or civilian defense) the first alert given when enemy aircraft are discovered approaching a military installation, city, coastline, etc. Compare blue alert, red alert, white alert.
- the signal or alarm sounded for this alert.
- any primary stage of alert, as when toxic chemicals have escaped in a particular area and a potential hazard exists.
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Word History and Origins
Origin of yellow alert1
First recorded in 1965–70
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