This is the 3211th most frequent Korean word.
공습
Air raid.
In this sentence, '공습' refers to an air raid or aerial attack as an act of aggression by the enemy forces.
적군이 새벽에 공습을 감행하였다.
The enemy launched an air raid at dawn.
Here, '공습' is used to describe a general concept of air raids that defense systems aim to combat.
방공 시스템은 공습에 대비하기 위한 중요한 도구이다.
Air defense systems are essential tools to prepare against air raids.
The term '공습' in this sentence directly refers to the occurrence of an air raid prompting evacuation by the residents.