自し然ぜん損そん耗もう

noun

normal wear and tear; natural wear

Refers to the expected deterioration of an object over time through ordinary use, not due to accident or misuse. Common in legal, insurance, and maintenance contexts.

• 賃ちん貸たい契けい約やくでは、自し然ぜん損そん耗もうによる傷きずは借かり主ぬしの負ふ担たんになりません。

  Under a rental contract, damage from normal wear and tear is not the tenant's responsibility.

• この部ぶ品ひんの自し然ぜん損そん耗もうは保ほ証しょうの対たい象しょう外がいです。

  Natural wear of this part is not covered by the warranty.