Taint meaning : A contamination, decay or putrefaction, especially in food A mark of disgrace, especially on one's character; blemish Tincture; hue; colour Infection; corruption; deprivation A marker indicating that a variable is unsafe and should be subjected to additional security checks. To contaminate or corrupt (something) with an external agent, either physically or morally. To spoil (food) by contamination. To be infected or corrupted; to be touched by something corrupting. To be affected with incipient putrefaction. To mark (a variable) as unsafe, so that operations involving it are subject to additional security checks. To invalidate (a share capital account) by transferring profits into it.