hornswoggle vs string on

hornswoggle

verb
  • To deceive or trick. 

noun
  • nonsense; humbug 

string on

verb
  • To continue to convince (someone) of something untrue; to maintain a lie or scam aimed at (someone). 

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