Definitions
1.verbTo discolour."armour stained with blood"
2.verbTo taint or tarnish someone's character or reputation
3.verbTo coat a surface with a stain"the stained glass used for church windows"
4.verbTo become stained; to take a stain.
5.verbTo treat (a microscopic specimen) with a dye, especially one that dyes specific features
6.verbTo cause to seem inferior or soiled by comparison.