air alert

air alert

noun
1.
the act of flying while waiting for combat orders or for enemy airplanes to appear.
2.
the signal to take stations for such action.

Origin:
1940–45

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World English Dictionary
air alert
 
n
1.  the condition in which combat aircraft are airborne and ready for an operation
2.  a signal to prepare for this

Collins English Dictionary - Complete & Unabridged 10th Edition
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