get under someone's skin vs placate

get under someone's skin

verb
  • To make a memorable impression or have a strong effect on someone; to impact someone's feelings, especially when such an effect is not expected or wanted. 

  • To irritate someone. 

placate

verb
  • To calm; to bring peace to; to influence someone who was furious to the point that they become content or at least no longer irate. 

How often have the words get under someone's skin and placate occurred in a corpus of books? (source: Google Ngram Viewer )