stain [ˈsteɪn]

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¹ stain verb

• to leave a mark on something
• to be marked or damaged by a stain
• to use a special liquid to change the color of (something)

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² stain noun

• a mark made on a surface, a piece of clothing, etc., that is very hard or impossible to remove
• a special liquid that is used to change the color of something (such as wood or cloth)
• something that causes people to have less respect for someone : something that damages a person's reputation—usually singular