a mark that is difficult to remove, especially one made by a liquid such as blood, coffee, or ink
There was a dark red stain on the carpet.
remove/get rid of a stain
White vinegar is great for removing stains.
wine/coffee/blood etc stain
How do you get wine stains out of a tablecloth?
stubborn stains (=ones that are very difficult to remove)
2 [uncountable and countable]TIC
a special liquid that you use to change the colour of something, especially wood [↪ dye]
something that damages the good opinion that people have about someone