勤きん続ぞく疲ひ労ろう

noun

long-service fatigue; performance decline from working too long

Jocular term modeled on 金属疲労 (metal fatigue). Used for a person whose performance has worsened after many years in the same job or role, or for a system that malfunctions after long continuous operation.

• 彼かれは勤きん続ぞく疲ひ労ろうで、最さい近きんミスが増ふえている。

  He's suffering from long-service fatigue and has been making more mistakes lately.

• この古ふるいサーバーは勤きん続ぞく疲ひ労ろうでよく落おちる。

  This old server often crashes due to long-term operational fatigue.