alert : Idioms & Phrases
air alert
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noun the time period during which military and civilian agencies are prepared for an enemy air attack
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noun the condition in which combat aircraft are airborne and ready for an operation
- aircraft in the Mideast are on air alert
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noun the warning signal that begins a period of preparation for an enemy air attack
WordNet
emergency alert system
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noun a federal warning system that is activated by FEMA; enables the President to take over the United States airwaves to warn the whole country of major catastrophic events
EAS.
WordNet
On the alert
- on the lookout or watch against attack or danger; ready to act.
Webster 1913
red alert
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noun the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger)
WordNet
seizure-alert dog
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noun a dog that can alert or assist people with seizure disorders
WordNet
strip alert
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noun a state of readiness for domestic defense aircraft
- the Air Force will keep fighters on strip alert at bases around the country