ear to the ground vs sagacious

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. 

sagacious

adj
  • Having or showing keen discernment, sound judgment, and farsightedness; mentally shrewd. 

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