金きん属ぞく疲ひ労ろう

noun

metal fatigue

Technical term in materials science and engineering for the weakening of metal due to repeated stress.

• 金きん属ぞく疲ひ労ろうが原げん因いんで橋はしの一いち部ぶが破は損そんした。

  Part of the bridge was damaged due to metal fatigue.