flash of a drawn sword; brandishing a sword
A dramatic, literary expression describing the moment a sword is drawn and flashes, or the act of brandishing it. Often used in historical or action narratives.
白刃一閃、敵の刀が光った。
With a flash of the drawn sword, the enemy's blade gleamed.
彼は白刃一閃、相手の武器をはじき飛ばした。
He brandished his sword and knocked away his opponent's weapon.