taint vs upgrade

taint

verb
  • To be affected with incipient putrefaction. 

  • To contaminate or corrupt (something) with an external agent, either physically or morally. 

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

  • To be infected or corrupted; to be touched by something corrupting. 

  • To thrust ineffectually with a lance. 

  • To invalidate (a share capital account) by transferring profits into it. 

  • To spoil (food) by contamination. 

  • To mark (a variable) as unsafe, so that operations involving it are subject to additional security checks. 

noun
  • A tinge, trace or touch. 

  • A mark of disgrace, especially on one's character; blemish. 

  • A marker indicating that a variable is unsafe and should be subjected to additional security checks. 

  • A contamination, decay or putrefaction, especially in food. 

  • A thrust with a lance, which fails of its intended effect. 

  • An injury done to a lance in an encounter, without its being broken; also, a breaking of a lance in an encounter in a dishonorable or unscientific manner. 

  • The perineum. 

upgrade

verb
  • To improve in condition or status. 

  • To improve, usually applied to technology, generally by complete replacement of one or more components 

  • To replace with something better. 

  • To improve the equipment or furnishings of or services rendered to 

  • To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name. 

adv
  • Up a slope or grade. 

noun
  • An upward grade or slope. 

  • An improvement 

  • An improved component or replacement item, usually applied to technology 

How often have the words taint and upgrade occurred in a corpus of books? (source: Google Ngram Viewer )