belittle vs big up

belittle

verb
  • To knowingly say that something is smaller or less important than it actually is, especially as a way of showing contempt or deprecation. 

big up

verb
  • To proclaim or exaggerate the importance of; to promote. 

  • To become big. 

noun
  • Significant respect or acclaim. 

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