relieve vs tone down

relieve

verb
  • To ease (a person, person's thoughts etc.) from mental distress; to stop (someone) feeling anxious or worried, to alleviate the distress of. 

  • To ease (someone, a part of the body etc.) or give relief from physical pain or discomfort. 

  • To release (someone) from or of a difficulty, unwanted task, responsibility etc. 

  • To free (someone) from debt or legal obligations; to give legal relief to. 

  • To alleviate (pain, distress, mental discomfort etc.). 

  • To urinate or defecate. 

  • To ease one's own desire to orgasm, often through masturbation to orgasm. 

  • To bring military help to (a besieged town); to lift the siege on. 

  • To free (someone) from their post, task etc. by taking their place. 

  • To provide comfort or assistance to (someone in need, especially in poverty). 

tone down

verb
  • To relax; to make quieter or less obtrusive; to make milder. 

  • To make a television program, piece of writing, etc. less offensive and so more suitable for a family audience. 

  • To moderate or relax; to diminish or weaken the striking characteristics of; to soften. 

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