noun
barrage balloon
A large tethered balloon used as a defense against low-flying aircraft, especially during World War II. Also referred to as 阻塞気球.
See also: 阻塞気球
第二次世界大戦中、ロンドン上空には多くの防空気球が浮かんでいた。
During World War II, many barrage balloons floated over London.
Synonym for barrage balloon; 阻塞気球 is an alternative term with the same meaning.
Compound of 防空 (air defense) and 気球 (balloon).