dead on vs definite

dead on

adj
  • very accurate 

adv
  • exactly at 

definite

adj
  • Free from any doubt. 

  • Having distinct limits. 

  • Designating an identified or immediately identifiable person or thing, or group of persons or things 

  • Determined; resolved; decided. 

noun
  • A word or phrase that designates a specified or identified person or entity. 

How often have the words dead on and definite occurred in a corpus of books? (source: Google Ngram Viewer )