予よ防ぼう線せん

noun

defensive perimeter; defense line

Literal military or physical defensive line. Also used figuratively for measures taken to prevent something.

• 敵てきの侵しん攻こうを防ふせぐために予よ防ぼう線せんを張はった。

  They set up a defensive perimeter to prevent the enemy's invasion.

noun

precaution; safeguard; safety measure

Almost always used in the phrase 予防線を張る, meaning to take precautions or lay the groundwork to avoid trouble or criticism.

See also: 予防線を張る

• 彼かれは失しっ敗ぱいしたときのために予よ防ぼう線せんを張はっておいた。

  He took precautions in case he failed.

• 上じょう司しに反はん論ろんされる前まえに予よ防ぼう線せんを張はる。

  I lay a safeguard before my boss can object.