tainting

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.

“Meat soon taints in warm weather.”

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.

To damage, as a lance, without breaking it; also, to break, as a lance, but usually in an unknightly or unscientific manner.

To hit or touch lightly, in tilting.

To thrust ineffectually with a lance.