failure of proof defenseglossary / FAILURE-OF-PROOF DEFENSE failure-of-proof defense. The defense that a party’s proof does not establish a fact essential to a claim or defense. 词条贡献者 资深译员Michael,毕业于一所培养高级翻译以及跨文化事务专家的精英大学,专注翻译各种与商业地产租赁有关的法律文件。