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tarnish 
1 
  vb befoul, blacken, blemish, blot, darken, dim, discolour, drag through the mud, dull, lose lustre  or  shine, rust, smirch, soil, spot, stain, sully, taint 
2 
  n blackening, black mark, blemish, blot, discoloration, rust, smirch, spot, stain, taint 
 
Antonyms  
,   vb brighten, enhance, gleam, polish up, shine