Noun
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an act that brings discredit to the person who does it
"he made a huge blot on his copybook"
-
a symbol of disgrace or infamy
"And the Lord set a mark upon Cain"--Genesis
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the state of being covered with unclean things
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(microscopy) a dye or other coloring material that is used in microscopy to make structures visible
-
a soiled or discolored appearance
"the wine left a dark stain"
Verb
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color for microscopic study
"The laboratory worker dyed the specimen"
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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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produce or leave stains
"Red wine stains the table cloth"
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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"