紫し電でん一いっ閃せん

noun, adverb

flash of lightning; flash of a sword; brandishing a sword

A yojijukugo describing a sudden, brilliant flash, originally of lightning, and by extension the swift, bright arc of a sword being drawn or swung. Often used in literary or dramatic contexts.

• 紫し電でん一いっ閃せん、雷らい鳴めいがとどろいた。

  A flash of lightning, and then thunder roared.

• 紫し電でん一いっ閃せん、彼かれの剣けんが敵てきを切きり裂さいた。

  With a flash of his sword, he cut down the enemy.