delate vs dob on

delate

verb
  • To carry or bring against, as a charge; to inform against. 

  • To carry abroad; to spread; to make public. 

  • To carry; to convey. 

  • To carry on; to conduct. 

dob on

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