防ぼう空くう壕ごうぼうくうごうFreq.FrequencyTop 50,000Meanings1nounair-raid shelter; bomb shelterA dugout or underground shelter used to protect against air raids and bombing, especially during wartime.戦せん時じ中ちゅう、人ひと々びとは防ぼう空くう壕ごうに避ひ難なんした。