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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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