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Từ điển Oxford Learners Wordfinder Dictionary
air alert


noun
1. the time period during which military and civilian agencies are prepared for an enemy air attack
Hypernyms:
time period, period of time, period
2. the condition in which combat aircraft are airborne and ready for an operation
- aircraft in the Mideast are on air alert
Hypernyms:
alert, qui vive
3. the warning signal that begins a period of preparation for an enemy air attack
Hypernyms:
alarm, alert, warning signal, alarum


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