decrease vs perk up

decrease

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. 

verb
  • Of a quantity, to become smaller. 

  • To make (a quantity) smaller. 

perk up

verb
  • to become more lively or enthusiastic. 

  • To cause to be more upright, straighten up 

  • to cause to be more lively or enthusiastic. 

  • His ears perked up when he heard there would be ice cream. 

  • To become more upright 

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