Definition of red alert
: the final stage of alert in which enemy attack appears imminent; broadly : a state of alert brought on by impending danger
Examples of red alert in a sentence
The troops have been put on red alert.
<the paparazzi were on red alert for sightings of the hot new Hollywood couple>
First Known Use of red alert
RED ALERT Defined for English Language Learners
Definition of red alert for English Language Learners
: a warning that there is great danger
Seen and Heard
What made you want to look up red alert? Please tell us where you read or heard it (including the quote, if possible).