Meaning

• 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.

Meaning

• 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.

Meaning

• Corrupted or filled with imperfections.

  "Hey, get that away from me! It was bought with tainted money."

• (of data) Originating from an untrusted source.

  "Do not use tainted values in SQL queries."