鈍どん磨ま

noun, noun or participle which takes 'suru', intransitive verb

dulling; becoming blunt

Used for the gradual loss of sharpness in blades or the decline of mental faculties, often in literary or formal contexts.

• 長なが年ねん使つかった包ほう丁ちょうは鈍どん磨まして切きれ味あじが落おちた。

  The kitchen knife, used for many years, dulled and lost its sharpness.

• 年としを取とるとともに感かん覚かくが鈍どん磨ましていくのを感かんじる。

  I feel my senses becoming duller as I grow older.