防ぼう衛えい線せん

noun

defense line; line of defense; enemy lines

Used for military defense lines, but also metaphorically for any defensive boundary or last line of defense.

• 敵てきの防ぼう衛えい線せんを突とっ破ぱする作さく戦せんが立たてられた。

  A plan was made to break through the enemy's defense line.

• この堤てい防ぼうは洪こう水ずいから街まちを守まもる最さい後ごの防ぼう衛えい線せんだ。

  This levee is the last line of defense protecting the town from floods.