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air alert

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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.
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Origin of air alert

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for air alert

air alert

noun military
  1. the condition in which combat aircraft are airborne and ready for an operation
  2. a signal to prepare for this
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012