tarnish
US
UK tarnish vi: (metal: lose shine) (金属)
SC 黯淡，失去光彩 àn dàn，shī qù guāng cǎi
Brass and silver both tarnish easily.
tarnish [sth] vtr: figurative (reputation: stain) (名声)
SC 受损, 蒙垢, 受辱
Allegations of sexual misconduct tarnished his reputation.
tarnish [sth] vtr: (metal: discolour, dull) (金属)
SC 使失去色彩, 使黯淡下去
Weather has tarnished the church's copper spire.
tarnish n: (metal: discoloration)
SC 金属失去光泽
The silverware has been sitting in a drawer for years and is covered in tarnish.