Pronunciation: (tär'nish),[key] —v.t. 1. to dull the luster of (a metallic surface), esp. by oxidation; discolor.
2. to diminish or destroy the purity of; stain; sully: The scandal tarnished his reputation.
—v.i. 1. to grow dull or discolored; lose luster.
2. to become sullied.
—n. 1. a tarnished coating.
2. tarnished condition; discoloration; alteration of the luster of a metal.
3. a stain or blemish.