電でん光こう石せっ火か

noun, noun which may take the genitive case particle 'no'

lightning speed; in a flash; instantaneous

A yojijukugo describing something happening with extreme speed, like a flash of lightning or a spark from a flint. Often used in contexts of quick action or reaction.

• 彼かれは電でん光こう石せっ火かの速はやさで問もん題だいを解かい決けつした。

  He solved the problem with lightning speed.

• 電でん光こう石せっ火かのごとく現あらわれた。

  He appeared in a flash.