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color with a liquid dye or tint;
"Stain this table a beautiful walnut color"
"people knew how to stain glass a beautiful blue in the middle ages"
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produce or leave stains;
"Red wine stains the table cloth"
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make dirty or spotty, as by exposure to air; also used metaphorically;
"The silver was tarnished by the long exposure to the air"
"Her reputation was sullied after the affair with a married man"
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color for microscopic study;
"The laboratory worker dyed the specimen"