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red alert

noun
1.
(in military or civilian defense) the most urgent form of alert, signaling that an enemy attack is believed to be imminent.
2.
the signal or alarm sounded for this alert.
3.
a signal or warning that a critical situation is developing or has occurred.
4.
the period during which a state of crisis or danger is declared to exist.
Origin of red alert
1960-1965
First recorded in 1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for red alert
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  • When the red alert flashed on throughout the ship it brought the others hurrying to the control cabin.

    Plague Ship Andre Norton

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4
4
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