tarnish

verb
1
if metal tarnishes or something tarnishes it, it no longer looks bright and shiny
کدر شدن, کدر کردن, تیره شدن, تیره کردن
2
to damage the good opinion people have of somebody/something
لطمه زدن به شهرت, خدشه وارد کردن, بدنام کردن
Reputations can be easily tarnished.
He hopes to improve the newspaper's somewhat tarnished public image.
synonym taint
noun
1
a thin layer on the surface of a metal that makes it look darker and less bright
تیره‌شدگی, تیرگی, کدری