Webster's English Dictionary

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tarnish

tar.nish \'ta:r-nish\ \-*-b*l\ vb [ME terniss-, stem of ternir] 1: to dull 
   or destroy the luster of by or as if by air, dust, or dirt :  SOIL, STAIN 
   2a: to detract from the good quality of : VITIATE  2b: to bring disgrace on 
   : SULLY  : to become tarnished  - tarnish n