stain >> /steɪn/
Definition: [transitive verb] Mark (something) with colored patches or dirty marks that are not easily removed.
Example: her clothing was stained with blood
Definition: [transitive verb] Color (a material or object) by applying a penetrative dye or chemical.
Example: wood can always be stained to a darker shade
Definition: [noun] A colored patch or dirty mark that is difficult to remove.
Example: there were mud stains on my shoes
Definition: [noun] A penetrative dye or chemical used in coloring a material or object.
Example: Now several companies are providing training for stamped concrete, polymer overlays, and chemical stains.