tarnish

名词 tarnish:

1. discoloration of metal surface caused by oxidation

动词 tarnish:

1. make dirty or spotty, as by exposure to air; also used metaphorically
   同义词：stain, maculate, sully, defile

1. The firm's good name was badly tarnished by the scandal.
   这件丑事玷污了公司的好名声。