Refers to a protective structure or trench used to take cover from air raids, shelling, or similar dangers. Often used in military or wartime contexts.
When the air-raid siren sounded, we hurried into the bomb shelter.
On the battlefield, the soldiers dug trenches to take cover.
Compound of 待避 (たいひ, 'taking refuge') and 壕 (ごう, 'trench' or 'dugout'). The exact historical derivation is uncertain, but the word likely emerged in military contexts during the early 20th century.