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tarnish (v.)

mid-15c. ternishen, "become tarnished; discolor," from Old French terniss-, present-participle stem of ternir "dull the luster or brightness of, make dim" (15c.), probably from terne (adj.) "dull, dark," which according to Diez is from a Germanic source cognate with Old High German tarnjan "to conceal, hide," Old English dyrnan "to hide, darken," from Proto-Germanic *darnjaz (see dern), but there are difficulties of form, sense, and date. Figurative sense is from 1690s. Related: Tarnished; tarnishing.

tarnish (n.)

1713, from tarnish (v.).

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Definitions of tarnish from WordNet
1
tarnish (v.)
make dirty or spotty, as by exposure to air; also used metaphorically;
The silver was tarnished by the long exposure to the air
Synonyms: stain / maculate / sully / defile
2
tarnish (n.)
discoloration of metal surface caused by oxidation;
From wordnet.princeton.edu