taint (v.) Look up taint at Dictionary.com
1570s, "to corrupt, contaminate," also "to touch, tinge, imbue slightly" (1590s), from Middle English teynten "to convict, prove guilty" (late 14c.), partly from Old French ataint, past participle of ataindre "to touch upon, seize" (see attainder). Also from Anglo-French teinter "to color, dye" (early 15c.), from Old French teint (12c.), past participle of teindre "to dye, color," from Latin tingere (see tincture). Related: Tainted; tainting.
taint (n.) Look up taint at Dictionary.com
c.1600, "stain, spot," from Old French teint "color, hue, dye, stain," from Latin tinctus "a dyeing," from tingere "to dye" (see tincture). Meaning "a moral stain, corruption, contaminating influence" is from 1610s.