dishonour vs dob in

dishonour

verb
  • To bring disgrace upon someone or something; to shame. 

  • To refuse to accept something, such as a cheque; to not honor. 

  • To violate or rape. 

noun
  • Shame or disgrace. 

  • Lack of honour or integrity. 

  • Failure or refusal of the drawee or intended acceptor of a negotiable instrument, such as a bill of exchange or note, to accept it or, if it is accepted, to pay and retire it. 

dob in

verb
  • To betray someone by informing on them. 

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