/steɪn/
noun
A discoloured spot or area.A blemish on one's character or reputation.A substance used to soak into a surface and colour it.A reagent or dye used to stain microscope specimens so as to make some structures visible.Any of a number of non-standard tinctures used in modern heraldry.verb
To discolour.To taint or tarnish someone's character or reputationTo coat a surface with a stainTo become stained; to take a stain.To treat (a microscopic specimen) with a dye, especially one that dyes specific featuresTo cause to seem inferior or soiled by comparison.