red alert
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noun
(in military or civilian defense) the most urgent form of alert, signaling that an enemy attack is believed to be imminent.
the signal or alarm sounded for this alert.Compare blue alert, white alert, yellow alert.
a signal or warning that a critical situation is developing or has occurred.
the period during which a state of crisis or danger is declared to exist.
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Nearby words
recycle, recycling, red, red admiral, red alder, red alert, red alga, red algae, red and the black, the, red angus, red ant
Origin of red alert
First recorded in 1960–65
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for red alert
This was the fourth straight day of red-alert sirens wailing in Tel Aviv, and we were getting used to it.
Red Alert in Tel Aviv: Fear Inside the Israeli City’s Bubble|Ethan Perlson|November 20, 2012|DAILY BEAST