vt.

1. 使失去光泽，使变灰暗
   Air and moisture tarnish silver.

   空气和潮湿使银子失去光泽。

2. 败坏，玷污（名誉等）
   The scandal tarnished his reputation.

   丑闻败坏了他的名誉。

vi.

1. 失去光泽，变灰暗
2. 蒙受耻辱，被玷污

n.[S]

1. 晦暗，无光泽
2. 玷污；污点
3. （金属表面的）失泽膜

v.

1. lose or cause to lose lustre, especially as a result of exposure to air or moisture.
2. make less valuable or respected:
   they make up negative stories to tarnish my image.

n.