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yellow alert

noun
1.
(in military or civilian defense) the first alert given when enemy aircraft are discovered approaching a military installation, city, coastline, etc.
2.
the signal or alarm sounded for this alert.
3.
any primary stage of alert, as when toxic chemicals have escaped in a particular area and a potential hazard exists.
Origin
1965-1970
1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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12
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