entrench

verb6

1. •
   To cut in; to furrow; to make trenches in or upon.

   • It was this very sword entrenched it. — 1604
2. •
   (figurative) 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.
3. •
   (figurative) To establish a substantial position in business, politics, etc.

   • Senator Cornpone was able to entrench by spending millions on each campaign.
4. •
   To dig or excavate a trench; to trench.
5. •
   To surround or provide with a trench, especially for defense; to dig in.

   • The army entrenched its camp, or entrenched itself.
6. •
   (figurative) 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.