腐ふ朽きゅう

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

decay; rot; deterioration

Refers to the process of organic matter or structures breaking down over time, often due to natural causes. Can be used both literally and figuratively.

• 古ふるい木もく造ぞうの家いえは腐ふ朽きゅうが進すすんでいる。

  The old wooden house is decaying.

• 湿しっ気けが多おおいと木もく材ざいが腐ふ朽きゅうしやすい。

  Wood tends to rot easily when there is a lot of moisture.