decrease vs take a dive

decrease

verb
  • Of a quantity, to become smaller. 

  • To make (a quantity) smaller. 

noun
  • A reduction in the number of stitches, usually accomplished by suspending the stitch to be decreased from another existing stitch or by knitting it together with another stitch. See Decrease (knitting). 

  • An amount by which a quantity is decreased. 

take a dive

verb
  • To decline rapidly. 

  • To lose or fail intentionally. 

  • To feign a knockout in order to lose intentionally. 

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