poison vs sweeten

poison

noun
  • A substance that is harmful or lethal to a living organism when ingested. 

  • Any substance that inhibits catalytic activity. 

  • Something that harms a person or thing. 

  • An intoxicating drink; a liquor. (note: this sense is chiefly encountered in the phrases "name your poison" and "what's your poison ?") 

verb
  • To place false information into (a cache) as part of an exploit. 

  • To cause (someone) to hate or to have unfair negative opinions. 

  • To use poison to kill or paralyse (somebody). 

  • To pollute; to cause to become poisonous. 

  • To cause to become much worse. 

  • To inhibit the catalytic activity of. 

sweeten

verb
  • To supplement (a composition) with additional instruments, especially strings. 

  • To make pure and salubrious by destroying noxious matter. 

  • To make warm and fertile. 

  • To restore to purity; to free from taint. 

  • To become sweet. 

  • To make less painful or laborious; to relieve. 

  • To soften to the eye; to make delicate. 

  • To make sweet to the taste. 

  • To make more attractive; said of offers in negotiations. 

  • To make (more) pleasant or to the mind or feelings. 

  • To make mild or kind; to soften. 

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