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The Collaborative International Dictionary of English v.0.48 (gcide)

Tarnish \Tar"nish\, v. t. [imp. & p. p. {Tarnished}; p. pr. &
vb. n. {Tarnishing}.] [F. ternir, fr. OHG. tarnen to darken,
to conceal, hide; akin to OS. dernian to hide, AS. dernan,
dyrnan, OHG. tarni hidden, OS. derni, AS. derne, dyrne. Cf.
{Dern}, a., and see {-ish}.]
To soil, or change the appearance of, especially by an
alternation induced by the air, or by dust, or the like; to
diminish, dull, or destroy the luster of; to sully; as, to
tarnish a metal; to tarnish gilding; to tarnish the purity of
color. "Tarnished lace." --Fuller. Used also figuratively;
as, to tarnish one's honor.
[1913 Webster]

Syn: To sully; stain; dim.
[1913 Webster]