get at vs give someone to understand

get at

verb
  • To persuade by intimidation, to tamper with. 

  • To manage to gain access to. 

  • To understand or ascertain by investigation. 

  • To begin working on or dealing with. 

  • To contact someone. 

  • To attack verbally or physically; to annoy, bother. 

  • To mean, signify. 

give someone to understand

verb
  • To tell someone, especially indirectly; to insinuate. 

How often have the words get at and give someone to understand occurred in a corpus of books? (source: Google Ngram Viewer )