虚きょに乗じょうずる

expression, zuru verb

catch off guard; take advantage of an opening

Rare literary expression meaning to exploit a moment of inattention or weakness. The verb 乗ずる is a classical -zuru form equivalent to 乗じる.

• 敵てきの虚きょに乗じょうじて攻せめ込こんだ。

  They attacked, taking advantage of the enemy's unguarded moment.

• 彼かれは相あい手ての虚きょに乗じょうずるのがうまい。

  He is good at catching his opponents off guard.