勤きん続ぞく疲ひ労ろうMeaningsNoun1. worsened performance because of long service; malfunctioning resulting from continuous long-term operation (Jocular, pun on 金属疲労)Kanji used勤devotion to work続continue疲tired労laborPitch accentきんぞくひろうComposed of勤きん続ぞくcontinuous serviceNoun疲ひ労ろうfatigue; weariness; exhaustion; tiredness; fatigue (of metal, etc.)Noun