寝刃ねたば

noun

dull blade; blunt sword

Refers to a blade that has lost its sharpness, often used in contexts of swords or knives. Somewhat literary or traditional in feel.

• 寝刃ねたばでは敵てきを切きれない。

  A dull blade cannot cut the enemy.

• この刀かたなは寝刃ねたばだから研とがなければならない。

  This sword is blunt, so it must be sharpened.