tarnish
verb
[ ˈtɑːnɪʃ ]
• lose or cause to lose lustre, especially as a result of exposure to air or moisture.
• "silver tarnishes too easily"
Similar:
become discoloured,
discolour,
stain,
rust,
oxidize,
corrode,
deteriorate,
become dull,
lose its shine,
lose its lustre,
blacken,
become black,
dull,
make dull,
dim,
make black,
tarnish
noun
• dullness of colour; loss of brightness.
Origin:
late Middle English (as a verb): from French terniss-, lengthened stem of ternir, from terne ‘dark, dull’.
