tarnish
英['tɑ?n??]
美['tɑrn??]
- n. 晦暗，無光澤；污點
- vt. 玷污；使……失去光澤；使……變灰暗
- vi. 失去光澤；被玷污；變灰暗
英英釋意
- 1. discoloration of metal surface caused by oxidation
