major air raid; large-scale bombing; blitz
Refers to a large-scale aerial bombing attack, often used in historical contexts (e.g., WWII). Can also be used as a suffix in compound nouns like 東京大空襲.
Many lives were lost in the Great Tokyo Air Raid on March 10, 1945.
This city suffered catastrophic damage from a major air raid.
A compound of 大 “large, major” and 空襲 “air raid,” denoting a major or large-scale aerial attack.