doorbell vs get on to

doorbell

verb
  • To ring many doorbells of (target people or an area) in an effort to contact people and thereby spread information or solicit. 

  • To ring many doorbells in an effort to contact people and thereby spread information or solicit. 

noun
  • A device on or adjacent to an outer door for announcing one's presence. It can be mechanical, directly sounding a bell, or a button that electrically sounds a chime or buzzer inside the building. 

  • A button that activates an electric doorbell. 

get on to

verb
  • To contact (someone) in order to raise or discuss a certain matter. 

  • Used other than figuratively or idiomatically: see get on, to. 

  • To progress to; to start working on. 

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