buy into vs disapprove

buy into

verb
  • To believe; to accept a craze or fad as valid. 

  • To buy stocks or shares of (a business). 

disapprove

verb
  • To have or express an unfavorable opinion. 

  • To condemn; to consider wrong or inappropriate; used with of. 

  • She disapproves of rap music because of its sometimes aggressive lyrics. 

  • To refuse to approve; reject. 

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