電でん光こう一いっ閃せん

noun

flash of lightning

A dramatic, literary expression for a sudden lightning flash; often used figuratively for something instantaneous.

• 暗くら闇やみに電でん光こう一いっ閃せん、雷らい鳴めいがとどろいた。

  A flash of lightning lit up the darkness, and thunder roared.

• 彼かれの頭あたまに電でん光こう一いっ閃せんのごとくアイデアが浮うかんだ。

  An idea flashed into his mind like a bolt of lightning.