a force of aircraft used to give air protection to a military operation.
| 单词 | θ165249 | 
| 释义 | society > armed hostility > hostilities in the air > group or unit on operation > 			[noun]		 > force giving air cover (2)		 air umbrella1941 a force of aircraft used to give air protection to a military operation. umbrella1941 A screen of fighter aircraft or a curtain of fire put up as protection against enemy aircraft. | 
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