jigsaw vs snarl up

jigsaw

verb
  • To cut something using a jigsaw. 

noun
  • Something that can be compared to a jigsaw puzzle. 

  • A power saw with fine teeth and a narrow blade which can cut curves in wood or metal. 

  • A jigsaw puzzle. 

snarl up

verb
  • To become tangled; to become entangled 

  • to become congested. 

  • to entangle 

  • To block (traffic); to cause (traffic) to be congested. 

  • To put into disarray; contort; confuse; muddle up 

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