tar·nish/`tɑrnɪʃ; ˈtɑːnɪʃ/ v 1 [T] if an event or fact tarnishes the opinion people have about someone or something, it makes it worse 玷污〔名誉等〕; 损害〔形象〕: the violence that tarnished Miami's reputation 令迈阿密声誉受损的暴力事件 2 [I] if a metal tarnishes, it becomes darker and less shiny 〔金属〕变暗，失去光泽