防ぼう楯じゅんぼうじゅんMeanings1noungun shield; artillery shieldmilitaryMilitary term for a protective shield mounted on a gun, especially artillery pieces, to protect the crew from small-arms fire and shell fragments.砲ほう兵へいは防ぼう楯じゅんの陰かげに身みを隠かくした。The artillerymen took cover behind the gun shield.