entrench vs implant

entrench

verb
  • To cut in; to furrow; to make trenches in or upon. 

  • To surround or provide with a trench, especially for defense; to dig in. 

  • To establish a substantial position in business, politics, etc. 

  • To dig or excavate a trench; to trench. 

  • To invade; to encroach; to infringe or trespass; to enter on, and take possession of, that which belongs to another; usually followed by on or upon. 

  • To become completely absorbed in and fully accept one's beliefs, even in the face of evidence against it and refusing to be reasoned with. 

implant

verb
  • To fix firmly or set securely or deeply. 

  • Of an embryo, to become attached to and embedded in the womb. 

  • To insert (something) surgically into the body. 

noun
  • Anything surgically implanted in the body, such as a tissue graft or prosthesis, particularly breast implants. 

  • A representative of a travel company, working within the office of a large client and exclusively dealing with that client. 

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