usage: 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"
2. stain, change, alter, modify
usage: produce or leave stains; "Red wine stains the table cloth"
3. tarnish, stain, maculate, sully, defile, spot, fleck, blob, blot
usage: 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"
4. stain, dye
usage: color for microscopic study; "The laboratory worker dyed the specimen"