ear to the ground vs intelligent

ear to the ground

noun
  • The practice or characteristic of carefully gathering information; a state or mindset of attentiveness. 

  • Pursuing the practice or having the characteristic of carefully gathering information; well-informed. 

intelligent

adj
  • Having an environment-sensing automatically-invoked built-in computer capability. 

  • Characterized by thoughtful interaction. 

  • Having at least a similar level of brain power to humankind. 

  • Of high or especially quick cognitive capacity, bright. 

  • Well thought-out, well considered. 

How often have the words ear to the ground and intelligent occurred in a corpus of books? (source: Google Ngram Viewer )