to dull the luster of (a metallic surface), esp. by oxidation; discolor.

to diminish or destroy the purity of; stain; sully

The scandal tarnished his reputation.

to grow dull or discolored; lose luster.

to become sullied.

a tarnished coating.

tarnished condition; discoloration; alteration of the luster of a metal.

a stain or blemish.

verb

clean , fix , polish , uncorrupt

verb

befoul , begrime , blacken , blemish , blot , contaminate , damage , darken , defame , defile , dim , discolor , disgrace , dull , embarrass , grime , harm , hurt , impair , injure , lose luster , lose shine , mar , muddy , pale , pollute , rust , slander , smear , smudge , soil , spoil , spot , stain , sully , taint , tar , vitiate , detract from , disserve , flaw , prejudice , besmear , besmirch , bespatter , cloud , denigrate , dirty , smut , spatter , corrode , corrupt , deface , diminish , discredit , fade , smirch

noun

black eye , blemish , blot , onus , spot , stigma , taint