tar·nish

[tahr-nish]
verb (used with object)
1.
to dull the luster of (a metallic surface), especially by oxidation; discolor.
2.
to diminish or destroy the purity of; stain; sully: The scandal tarnished his reputation.
verb (used without object)
3.
to grow dull or discolored; lose luster.
4.
to become sullied.
noun
5.
a tarnished coating.
6.
tarnished condition; discoloration; alteration of the luster of a metal.
7.
a stain or blemish.

Origin:
1590–1600; < Middle French terniss-, long stem of ternir to dull, deaden, derivative of terne dull, wan < Germanic; compare Old High German tarni, cognate with Old Saxon derni, Old English dierne hidden, obscure; see -ish2

tar·nish·a·ble, adjective
an·ti·tar·nish, adjective
an·ti·tar·nish·ing, adjective
non·tar·nish·a·ble, adjective
non·tar·nished, adjective
non·tar·nish·ing, adjective
un·tar·nish·a·ble, adjective
un·tar·nished, adjective
un·tar·nish·ing, adjective


2. taint, blemish, soil.


1. brighten.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To Tarnishing
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Tarnishing is always a great word to know.
So is flibbertigibbet. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
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World English Dictionary
tarnish (ˈtɑːnɪʃ) [Click for IPA pronunciation guide]
 
vb
1.  to lose or cause to lose the shine, esp by exposure to air or moisture resulting in surface oxidation; discolour: silver tarnishes quickly
2.  to stain or become stained; taint or spoil: a fraud that tarnished his reputation
 
n
3.  a tarnished condition, surface, or film
 
[C16: from Old French ternir to make dull, from terne lustreless, of Germanic origin; related to Old High German tarnen to conceal, Old English dierne hidden]
 
'tarnishable
 
adj
 
'tarnisher
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

tarnish
1598, from prp. stem of M.Fr. ternir "dull the luster or brightness of, make dim" (15c.), probably from O.Fr. adj. terne "dull, dark," from a Frank. source cognate with O.H.G. tarnjan "to conceal, hide," O.E. dyrnan "to hide, darken," from P.Gmc. *darnijaz, related to dark.
Figurative sense is from 1697. The noun is recorded from 1713.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People rarely approach the subject in fear of tarnishing a reputation.
But with that staggering increase in demand for services come myths that are
  tarnishing the purpose of the welfare system.
Again, they mention the potential for tarnishing if there is no solder on the
  pads.
In another controlled chamber, the team heats a coated wafer to speed up the
  tarnishing.
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