鈍どんする

suru verb (special), intransitive verb

become dull; lose sharpness; become insensitive

Describes a decline in mental sharpness, sensitivity, or skill. Often used for senses, intuition, or ability becoming blunted over time.

• 年としをとると感かん覚かくが鈍どんする。

  As you get older, your senses become dull.

• 長ながい休やすみで腕うでが鈍どんした。

  My skills got rusty over the long break.